Thanks!

I did some digging in the parts books.

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71 B bodies used a rear qtr window leading edge seal with a long tab. Part# 3581170-1

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72-74 B bodies used a rear qtr window leading edge seal with a short tab. Part# 3582136-7

Metro sells the part with the short tab for all 71-74 B bodies. I'll have to bring this new info I found to their attention and see if we can get correct ones made for 71 B bodies The E body seal looks VERY similar to and has the longer tab like the 71 B body. I'll have to see if that one fits / works on a 72-74 B body.