The Pickups mod kind of does this already

a 4 door mustang is blasphemy

http://www.mediafire.com/file/psc1ia89f0t4p4i/Hair.rar/file

For some reason I can't get the hair model to stay in place. I can successfully convert the model to ydd, but you'll need a more experienced modder to make it work properly

Do you have any texture files?

Send me the obj, I can try to help

I don't know where to find this mod, but I'm 99% sure the video is from gta 4

try this: http://www.mediafire.com/file/5jyfsniu0yr90tv/Trevor_Beerhat.rar/file