Hi everybody
I found this thread intriguing in a "what came first, the chicken or the egg" sort of way. So I did a bit of Googleing
The closest match I found for a reference is the 1976 Buick Riviera. (Image 1 )
The high poly version was made from scratch to be used as a legitimate optional replacement for the original low poly car.
The download for the game consists of a Texture file and a second file containing the low poly version, image 3 and the the high poly mesh ( including other high poly parts, motor, suspension etc etc, plus parts for a crashed version, dented panels broken windows etc etc ) all superimposed on top of each other with many parts bundled together in the middle of the vehicle.This I expect was done deliberately to comply with the way the game handles such files.
The wheels are missing perhaps because they got corrupted when opening in Blender or perhaps they have place holders for wheels to be attached in the game.
I hope this answers some of the suggestions made here .
I just noticed something, in image 5 I forgot to remove the number plate, the badge on the bonnet and the little sticker on the windscreen.