Reading lamp equipped dome light became a Pontiac option for the 70 model year but had surfaced earlier on other divisions. No need for an adaptor plate, the two screws that hold it to the roof have identical locations.
Btw, 70 and 73 were the only years that had Canadian production of the GTO and it was only for two door hardtops (not convertibles) and if I'm not mistaken no RA IV's. I've noticed a few distinctive things on Oshawa built GTO's like the lack of sealer on the lower door seams and a red goop used to hold the trunk mat.
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My Break Away Squad
1969 Fbird (Base, 350 & Sprint Cvt’s - 400HO & TA Hardtops)
1969 LeMans (2dr & 4dr Hardtop and a Cvt)
1969 LeMans Safari 2 seat Wagon
1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop)
1969 Catalina (3 Cvt’s & a 2dr hardtop)
1969 Ventura 2 Seat Wagon
1969 Executive 4dr Sedan
1969 Bonnie Cvt
1969 Bonnie 3 Seat Wagon (2 of them)
1969 Bonnie Brougham (4dr Hardtop & Cvt)
1969 Grand Prix SJ (2 of them)
1969 2+2 2dr Hardtop (Canadian model)
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