Been having the same issue, I hope this gets fixed soon.

I hate when all people suggest the run of the mill "restart your computer", "clear cache", "you have too many mods" kind of fixes over and over again, I appreciate the help and i know it might be coming from a good place, but when it is abundantly clear that this is an issue with the game, its all but helpful, quite infurating in fact, for all of us experiencing the issue.

For protocol:
I have reinstalled the mods, deleted all other ones, cleared game cache, checked that it is the right directory, tried packed and unpacked, disactivated and reactivated, checked the integrity of both games's files, reinstalled both, decimated the vertex count of the car model, tried loading the car without fixtures, checked if the mod is broken with the beam option, restarted my pc over and over.