I have that game.
And just happen to be an administrator over at the BOX Designs Messageboard
, a (formerly) big Midtown Madness modding website...
Read the readme of that Bonneville, I'm in there
. Qwerty'* a cool guy.
He sent me the development files for the '89, and I was going to attempt to make a '91 SSE. But I sorta gave up after a while
That'* about as far as I got -- the black colour and some gold trim
that was the original thread as the car was being made. I had my part :P
edit: I still have all the files. Not the one .ar file you need to drive it, but all the sounds, textures, and models.