Performance Years Pontiac has a full size Pontiac parts catalog you can view on line:
http://performanceyears.com/CatStart.asp
Ames Performance also has a full size Pontiac catalog you can view on line:
http://www.amesperf.com/index.html
California Pontiac Restoration has full size Pontiac parts:
http://www.pontiacparts.net/
For used parts try Steve at
http://www.pontiacheaven.org/ or the other Steve at
http://www.indianapontiacs.com/