FWIW, Steering adaptors, On a Mitsubishi a steering wheel adaptor will fit the 1971 Colts I have as well as every other car and truck till now. The taper and spline of the shaft are the same.
There was a change to the indicator return a few decades ago. The early cars had two roll pins that tripped the release for the indicators. But all Mitsues since have been using a drum that is driven by the steering hub with a 3 tap drive.
Only the adjustable wheel in the 89-91 Mirage Gt had a different dimension, depth wise, but the spline is the same.
I have not been swapping airbag wheels but I would be happy to check interchange of the clockspring since of the thirty some odd cars I have there are a few with bags.