I agree Bill.

So I've heard (and read) many times that Chrysler didn't sell the numbers they had hoped of the 70 E bodies and cheapened them in 71 (and up).

The qtr glass to door glass seals were "flocked" (covered in that black fuzzy stuff) in 70 and not in 71 and up as one of the cost saving measures.

On these convertible A pillar seals I would assume they used a screw with the embedded metal plate in 70 and then no screw (and embedded plate) in 71.

But the length difference? Doubt its shrinkage. And I think if I have to suggest which one to make it would be "without the screw hole" version only because the market is so small anyway and to keep the cost down.