
Instructions: Navigate to dlcpacks > mpsum > dlc.rpf > x64 > gta5 > vehicles > mpsum.rpf and replace the 4 vehicle files.

Carvariations: Navigate to dlcpacks > mpsum > dlc.rpf > common > data and replace carvariations.meta
Vehicles.meta: Navigate to dlcpacks > mpsum > dlc.rpf > common > data > levels > gta5 and replace vehicles.meta