Then I lean back to the possibility the screws are too long? What if you tried to install the latch with just two screws, tighten it in place in each of the three possible combinations of 2 of 3 screws installed.
Another possibility is that the door in that area is deformed and tightening the screws distorts the latch.
Last possibility I can think of is that some part of the lock linkage is wrong or deformed and is causing a problem.
I’m assuming the problem isn’t the latch as you mentioned you’ve tried a second latch with identical results.
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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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