I am still searching, following your ideas, Gdads51.
Steele does have the rear quarter window weatherstrip for 1966 (not '60 or '61), but it has molded, square corners, so a no go as is for me. On the other hand, they show the cross-section, and it is indeed the same as the '55-'59. So, I should be able to buy the part you linked for me, on Classic Parts. But then, if it is the same cross-section (as per Steele), why isn't Classic Parts showing it as a '55-'59 too?
Thanks for helping think and make some progress in my search!
