AIRHORN_EQD (0x0EA58C7C)--> Airhorn
SIREN_PA20A_WAIL (0x0D329446)--> Police Main
SIREN_2 (0x1DCB1748)--> Police Secondary
POLICE_WARNING (0x0A76DF50)--> Priority
FIRE_TRUCK_HORN (0x14BFBCE3)--> Firetruck Horn
SIREN_FIRETRUCK_QUICK_01 (0x161768E7)--> Firetruck Main
SIREN_FIRETRUCK_WAIL_01 (0x159C9182)--> Firetruck Secondary
AMBULANCE_WARNING (0x05C844CA)--> Priority 2
SIREN_QUICK_01 (0x144C8602)--> Ambulance
SIREN_WAIL_01 (0x1C98C4D5)--> Ambulance
SIREN_QUICK_02 (0x0A49B203)--> FIB
SIREN_WAIL_02 (0x0A8960B6)--> FIB
SIREN_QUICK_03 (0x013F5FE7)--> motorcycle
SIREN_WAIL_03 (0x17DDFB5C)--> motorcycle
SIREN_QUICK_04 (0x16E74B3E)--> granger
SIREN_WAIL_04 (0x0E0DA7BC)--> granger
So for whatever reason you cannot see the hashes for sirens, this might help (figured this out myself annoyingly) hope this helps because every siren replacement I've seen provides only the name hash for the siren so I have to go in and change the name to match it's counterpart in the vehicles.awc