Alright, let's try again:
Here's the candidates:
Ford GT40
Bentley EXP Speed 8 (hard to find a 1024x768 pic of 2005 model)
McLaren F1 GTR "longtail" (hard to find 1024x768 pic)
Mazda 787B
Ferrari 333SP
Corvette C6-R
Ferrari 330 P3/ P4
BMW 3.0 CSL (Also surprisingly hard to find 1024x768 pic)
Holden Commodore VZ HRT V8 (hard to find pic)