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.