My belt is a bit longer, but ordered a smaller one to test:
GATES 6pk 1973 6pk1973 Micro V Ribbed belt
GTM mod details:
http://www.gtmotorsports.com/product.php?productid=16475&cat=258&page=1
Cheers mate. Did you use the standard belt for the 3.33 pulley? When i ordered the 3.12 the guy said it would need a smaller belt so i got the one that says it does the 3.12 and the 2.97 or whatever it is. Cant remember what length it was though