Get 3 72 door seals and splice them together.
Kim at Idaho Z car told me to do this but I havent put mine on yet. (he was working on a 2+2)
Mine are PRP part #76801 n4600. I guess the 72 are the same as the 70-78 coupes, so just get 3 coupe door weatherstrips. 2 of one side, one of the other.
Heres the 72 weatherstripping.
http://www.thezstore.com/page/TZS/PROD/34-1068
Replaced with this.
http://www.thezstore.com/page/TZS/PROD/34-1074A
These are both the LH side.