The police transporter has the two rear seats in the back, so would replacing it with the ford explorer work?

Yeah it does, I replaced policet with the explorer and it works just fine. You just need to go into vehicle.meta for the update.rpf and set the liveries and sirensettings.

Thanks,

 

Could you most the changes you made to the vehicle so that I could change them myself?

I added these lines to mods/update/update.rpf/common/data/levels/gta/vehicles.meta

<Item>
      <modelName>policet</modelName>
      <txdName>policet</txdName>
      <handlingId>baller2</handlingId>
      <gameName>baller2</gameName>
      <vehicleMakeName />
      <expressionDictName>null</expressionDictName>
      <expressionName>null</expressionName>
      <animConvRoofDictName>null</animConvRoofDictName>
      <animConvRoofName>null</animConvRoofName>
      <animConvRoofWindowsAffected />
      <ptfxAssetName>null</ptfxAssetName>
      <audioNameHash>police3</audioNameHash>
      <layout>LAYOUT_STD_EXITFIXUP</layout>
      <coverBoundOffsets>POLICE3_COVER_OFFSET_INFO</coverBoundOffsets>
      <explosionInfo>EXPLOSION_INFO_DEFAULT</explosionInfo>
      <scenarioLayout />
      <cameraName>DEFAULT_FOLLOW_VEHICLE_CAMERA</cameraName>
      <aimCameraName>MID_BOX_VEHICLE_AIM_CAMERA</aimCameraName>
      <bonnetCameraName>VEHICLE_BONNET_CAMERA_MID_NEAR</bonnetCameraName>
      <povCameraName>DEFAULT_POV_CAMERA</povCameraName>
      <FirstPersonDriveByIKOffset x="0.000000" y="-0.060000" z="-0.030000" />
      <FirstPersonDriveByUnarmedIKOffset x="0.000000" y="0.000000" z="-0.020000" />
      <FirstPersonProjectileDriveByIKOffset x="0.055000" y="-0.075000" z="-0.045000" />
      <FirstPersonProjectileDriveByPassengerIKOffset x="-0.055000" y="-0.075000" z="-0.045000" />
      <FirstPersonProjectileDriveByRearLeftIKOffset x="0.000000" y="0.000000" z="0.000000" />
      <FirstPersonProjectileDriveByRearRightIKOffset x="0.000000" y="0.000000" z="0.000000" />
      <FirstPersonDriveByLeftPassengerIKOffset x="0.000000" y="0.000000" z="0.000000" />
      <FirstPersonDriveByRightPassengerIKOffset x="0.000000" y="-0.060000" z="-0.030000" />
      <FirstPersonDriveByRightRearPassengerIKOffset x="0.000000" y="0.000000" z="0.000000" />
      <FirstPersonDriveByLeftPassengerUnarmedIKOffset x="0.000000" y="0.000000" z="0.000000" />
      <FirstPersonDriveByRightPassengerUnarmedIKOffset x="0.000000" y="0.000000" z="0.000000" />
      <FirstPersonMobilePhoneOffset x="0.130000" y="0.275000" z="0.530000" />
      <FirstPersonPassengerMobilePhoneOffset x="0.136000" y="0.223000" z="0.425000" />
      <FirstPersonMobilePhoneSeatIKOffset>
        <Item>
            <Offset x="0.136000" y="0.156000" z="0.445000" />
            <SeatIndex value="2" />
        </Item>
        <Item>
            <Offset x="0.136000" y="0.156000" z="0.445000" />
            <SeatIndex value="3" />
        </Item>
      </FirstPersonMobilePhoneSeatIKOffset> 
      <PovCameraOffset x="0.000000" y="-0.175000" z="0.675000" />
      <PovCameraVerticalAdjustmentForRollCage value="0.000000" />
      <PovPassengerCameraOffset x="0.000000" y="0.000000" z="0.000000" />
      <PovRearPassengerCameraOffset x="0.000000" y="0.000000" z="0.000000" />
      <vfxInfoName>VFXVEHICLEINFO_CAR_GENERIC</vfxInfoName>
      <shouldUseCinematicViewMode value="true" />
      <shouldCameraTransitionOnClimbUpDown value="false" />
      <shouldCameraIgnoreExiting value="false" />
      <AllowPretendOccupants value="true" />
      <AllowJoyriding value="false" />
      <AllowSundayDriving value="false" />
      <AllowBodyColorMapping value="false" />
      <wheelScale value="0.244000" />
      <wheelScaleRear value="0.244000" />
      <dirtLevelMin value="0.000000" />
      <dirtLevelMax value="0.300000" />
      <envEffScaleMin value="0.000000" />
      <envEffScaleMax value="1.000000" />
      <envEffScaleMin2 value="0.000000" />
      <envEffScaleMax2 value="1.000000" />
      <damageMapScale value="0.600000" />
      <damageOffsetScale value="1.000000" />
      <diffuseTint value="0x00FFFFFF" />
      <steerWheelMult value="1.000000" />
      <HDTextureDist value="5.000000" />
      <lodDistances content="float_array">
        15.000000
        30.000000
        70.000000
        140.000000
        500.000000
        500.000000
      </lodDistances>
      <minSeatHeight value="0.83" />
      <identicalModelSpawnDistance value="20" />
      <maxNumOfSameColor value="10" />
      <defaultBodyHealth value="1000.000000" />
      <pretendOccupantsScale value="1.000000" />
      <visibleSpawnDistScale value="1.000000" />
      <trackerPathWidth value="2.000000" />
      <weaponForceMult value="1.000000" />
      <frequency value="100" />
      <swankness>SWANKNESS_0</swankness>
      <maxNum value="2" />
      <flags>FLAG_HAS_LIVERY FLAG_EXTRAS_REQUIRE FLAG_LAW_ENFORCEMENT FLAG_EMERGENCY_SERVICE FLAG_NO_RESPRAY FLAG_DONT_SPAWN_IN_CARGEN FLAG_HAS_INTERIOR_EXTRAS FLAG_REPORT_CRIME_IF_STANDING_ON</flags>
      <type>VEHICLE_TYPE_CAR</type>
      <plateType>VPT_BACK_PLATES</plateType>
      <dashboardType>VDT_GENTAXI</dashboardType>
      <vehicleClass>VC_EMERGENCY</vehicleClass>
      <wheelType>VWT_SPORT</wheelType>
      <trailers />
      <additionalTrailers />
      <drivers>
        <Item>
          <driverName>S_M_Y_Cop_01</driverName>
          <npcName />
        </Item>
      </drivers>
      <extraIncludes />
      <doorsWithCollisionWhenClosed />
      <driveableDoors />
      <bumpersNeedToCollideWithMap value="false" />
      <needsRopeTexture value="false" />
      <requiredExtras />
      <rewards>
        <Item>REWARD_WEAPON_PUMPSHOTGUN</Item>
        <Item>REWARD_AMMO_PUMPSHOTGUN_ENTER_VEHICLE</Item>
        <Item>REWARD_STAT_WEAPON</Item>
      </rewards>
      <cinematicPartCamera>
        <Item>WHEEL_FRONT_RIGHT_CAMERA</Item>
        <Item>WHEEL_FRONT_LEFT_CAMERA</Item>
        <Item>WHEEL_REAR_RIGHT_CAMERA</Item>
        <Item>WHEEL_REAR_LEFT_CAMERA</Item>
      </cinematicPartCamera>
      <NmBraceOverrideSet />
      <buoyancySphereOffset x="0.000000" y="0.000000" z="0.000000" />
      <buoyancySphereSizeScale value="1.000000" />
      <pOverrideRagdollThreshold type="NULL" />
      <firstPersonDrivebyData>
        <Item>STD_POLICE3_FRONT_LEFT</Item>
        <Item>STD_POLICE3_FRONT_RIGHT</Item>
        <Item>STD_POLICE2_REAR_LEFT</Item>
        <Item>STD_POLICE2_REAR_RIGHT</Item>
      </firstPersonDrivebyData>
    </Item>

And these lines into carvariations.meta in the mpchristmas folder (if I remember correctly)

<Item>
  <modelName>policet</modelName>
  <colors>
    <Item>
      <indices content="char_array">
        134
        134
        156
        156
      </indices>
      <liveries>
        <Item value="true" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
      </liveries>
    </Item>
    <Item>
      <indices content="char_array">
        134
        134
        156
        156
      </indices>
      <liveries>
        <Item value="false" />
        <Item value="true" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
      </liveries>
    </Item>
    <Item>
      <indices content="char_array">
        134
        134
        156
        156
      </indices>
      <liveries>
        <Item value="false" />
        <Item value="false" />
        <Item value="true" />
        <Item value="false" />
        <Item value="true" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
      </liveries>
    </Item>
    <Item>
      <indices content="char_array">
        134
        134
        156
        156
      </indices>
      <liveries>
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="true" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
      </liveries>
    </Item>
    <Item>
      <indices content="char_array">
        134
        134
        156
        156
      </indices>
      <liveries>
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="true" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
      </liveries>
    </Item>
    <Item>
      <indices content="char_array">
        134
        134
        156
        156
      </indices>
      <liveries>
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="true" />
        <Item value="false" />
        <Item value="false" />
      </liveries>
    </Item>
    <Item>
      <indices content="char_array">
        134
        134
        156
        156
      </indices>
      <liveries>
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="true" />
        <Item value="false" />
      </liveries>
    </Item>
    <Item>
      <indices content="char_array">
        134
        134
        156
        156
      </indices>
      <liveries>
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="false" />
        <Item value="true" />
      </liveries>
    </Item>
  </colors>
  <kits>
    <Item>157_massacaro2_modkit</Item>
  </kits>
  <windowsWithExposedEdges />
  <plateProbabilities>
    <Probabilities />
  </plateProbabilities>
  <lightSettings value="1" />
  <sirenSettings value="13" />
</Item>