I scanned this picture from the Pontiac GTO Restoration
Guide (pg.165) by Paul Zazarine & Chuck Roberts.
It states they are the correct seat belts for '67.
My '68 Firebird has the metal buckles shown on the left and I know they
are the originals. Are the buckles pictured still what they put in
the 68's? I need a set for my GTO and would prefer the metal
buckles.
Email me if you have a set.
The shoulder belt option is shown in the illustration below, also from the Pontiac GTO Restoration Guide (pg.172) by Paul Zazarine & Chuck Roberts.