Performance Years has a catalog of parts for the 'full size' pontiacs and so does Ames Performance. They both specialize in Pontiac stuff.
Performance Years has a catalog for 1955-76 FULLSIZE PONTIAC & GRAND PRIX
Ames has a catalog for the 1955-1977 FULLSIZE PONTIAC & GRAND PRIX
Hope this helps.
Of course neither of these hardly have anything for the 59 since alot of the parts for the 59 only fit one year.