Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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Most likely your GTO's stainless rocker trim was damaged or lost with previous owners and a previous owner replaced the rocker trim with pieces from a '68 or 69 2 door LeMans that had the emblem piercing holes and 350 emblems. If the moldings are anodized aluminum, the entire moldings have been replaced with '70-72 pieces.
Pontiac first placed 400 emblems on the bottoms of the fenders (or on the rocker trim) of '70 Tempest/T-37 and '70-72 LeMans, & LeMans Sports. While this style of 400 emblem emblem began to be fairly hard to find in yards, they have reproduced for nearly 20 years. My '72 LeMans post still has its original 400 rocker trim emblems.