Here it is, and as indicated from a 1968 AC Delco Radio Service Manual, it's a 1968 player, used in Full Size Pontiac's (B-body), Tempest & Beaumont A-body cars. The player is a little dusty, fresh from the garage. There's 2 harnesses, you'll notice on the 2nd harness that the brown wire loops back into the 8 pin connector of the player. I can't remember what that's for.
That 8-track unit part # also shows as correct for 1967 Pontiacs & Tempests as per my 1967 Delco book. It really cleaned up nicely, and I can't think of a nicer and better showcase vehicle that your GTO. Just, WOW!!!
BTW, for anyone wanting to see what a 1967 Beaumont AM/FM radio looks like, dsikkema provided the best pic since that is all there was. They did not do one with the Beaumont script, it would have to have PONTIAC on the slider and really would have been a special-order unit for a dealer to bring in from the U.S.
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67 Chevelle Malibu Sport Coupe, Oshawa-built 250 PG never disturbed.
In garage, 296 cid inline six & TH350...
Cam, Toronto.
I don't judge a man by how far he's fallen, but by how far back he bounces - Patton