Second this request. I know two people who converted this car to Gta V but one wishes to keep his identity private as well as his mods, and the other is Just_Rik0 that some of you may know here. (These two made good ones, idk if there's some crappy 1s around)
Riko made a beautiful Supra and a FT-1 Concept, both of which look really good and I'm dying to get them, but it doesn't seem like it's happening any soon.
A friend of mine recently talked to him and he said that some prick from this site here tried to rip him off/get him in trouble for accepting money for his mods (which are, of course, just like most other car mods, ripped from other games) so he stopped selling anything and may or may not release his current creations in the future, but it's not planned.

P.S. Gran Turismo Sport has a nice 2020 Supra as well as the Gazoo Racing Concept version of it, and an FT-1 Concept we could get. Car Mechanic Simulator also has a regular 2020 Supra afaik.

@tk0wnz You're one of the best creators I know, I'm sure many of us would happily buy these off you, myself included.