to replace the buffalo2, if you don't have the x64e in mods folder then you would need to get a copy of the x64e over to the mods folder.

the steps after getting the copy done is to mods/x64e.rpf/levels/gta5/vehicles.rpf and there you drag and drop the replace files you just downloaded.

i also added the vanilla files incase you want to get back the normal vanilla car, its just to do the same steps again.
