667 - GTP/GS/SS supercharged with stock 3.8" pulley (67 1/4" -1708mm)
658 - GTP/GS/SS supercharged with 3.2 - 3.5" pulley (66 3/8" - 1687mm)
650 - GTP/GS/SS supercharged with 2.9 - 3.1" pulley
645 - GTP/GS/SS supercharged with 2.6 - 2.8" pulley
716 - Bonneville SSEi with a 3.4" pulley
721 - Bonneville SSEi with stock supercharger pulley (72 5/8" 1845mm)

Taken straight from http://www.grandprixforums.net/threa...ding-Your-3800!