Welcome here. Our member Pontorquer in Elie has some Pontiac parts. I see he hasn't logged in for 10 days. You could try a private message to him, that might be best. He may well have something for you.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
that's the exact same guy I tried telling you about on the PY forum;
He's there too, but I couldn't find his user name there.
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1970 Formula 400 Carousel Red on black (std) interior "no drivetrain option" car (same base drivetrain as GTO) 1:411 1970 Firebird Formulas originally sold in Canada