tried changing the file name, but when i go in game and type in what i renamedit as it says its not found, its also not in my police garage, but when i go to my openiv the vehicle model is there and i can click on it and see it. 

You can't just give the vehicle any name, that is basic knowledge. Check some tutorials on how to install vehicles.

Spoiler

Vehicles Replace vehicles Rename your vehicle files to the slot you'd like to replace (i.e. "police3") Drag and drop yft + ytd (some have hi infront of them - they are still ytf/ytd files) files into this path: GTAV/mods/update/x64/dlcpacks/patchday26/dlc.rpf/x64/levels/gta5/vehicles.rpf. Addon vehicles Using OpenIV navigate to the following path: mods\update\x64\dlcpacks Drag and drop the vehicle folder into the dlcpacks folder. Again still using OpenIV navigate to mods\update\update.rpf\common\data\dlclist.xml Add the line below to the file. "DLC folder" can be used interchangeably with whatever the name is of your vehicle pack <Item>dlcpacks:/DLC folder/</Item> If your vehicle is for ELS then make sure to install the XML files in pack_default Weapons Drag and drop all the .ytd and .ydr files into GTAV/mods/update/x64/dlcpacks/patchday10/dlc/x64/models/cdimages/weapons OIV Package Installation Drag the .OIV to your desktop. Following OpenIV > Tools > Package Installer, select the .OIV and install it into your mods folder. Note: These are generalised instructions. View the install documentation for specific guides.

these are the vehicle names you can assign:

Spoiler

List of replaceable emergency vehicles:

Police: Police - Vapid Stanier Police Cruiser Police2 - Bravado Buffalo Police3 - Vapid Interceptor Police4 - Unmarked Vapid Stanier Police Cruiser PoliceOld1 - North Yankton Declasse Rancher PoliceOld2 - North Yankton Albany Esperanto PoliceB - WMC Police bike PoliceT - Declasse Police Transport PolMav - Buckingham Police Maverick Riot - Brute Police Riot Riot2 - Brute RCV (Riot Control Van/Vehicle) FIB: FBI - Unmarked FIB Bravado Buffalo FBI2 - Unmarked FIB Declasse SUV Sheriff: Sheriff - Vapid Sheriff Cruiser Sheriff2 - Declasse Sheriff SUV Park Rangers: Pranger - Park Ranger Declasse Granger EMS/FD: Firetruk - MTL Firetruck Ambulance - Brute Ambulance Lifeguards: Lguard - Declasse Lifeguard SUV Blazer - Nagasaki Blazer Lifeguard Miscellaneous: Pbus- Brute Prison Bus Dilettante2 - Karin Dilettante Merryweather Security Consulting

 

I would recommend you to join a lspdfr support discord channel, which these message are from:

https://discord.gg/gk2FrE76