Inspired by eag8 and this post on the FC forum,

https://www.rx7club.com/2nd-generati...shaft-1081644/

I’ve started to piece together parts for my project. The main issue was the part listed for NA flange (2602-37) does not fit the 83-85 flange. I needed the 2602-35 for the 83-85 driveshaft. There is a 2602-29 that fits a bolt diameter of 2.946”. I don’t know if this covers the 79-83 years or not.

Transmission yokes for look accurate for 2603-22 for NA transmissions and 2603-25 for transmissions from turbocharged rx7s.

I would deeply suggest reading the linked thread for a deeper look.