What steering coupler do I need?

philcollins said
Look good.
just to be sure, check this:

On the steering columns there is a witness hole in the shaft. The Factory Service Manual specs calls for aligning the center point of the hole 13/16" above the top of the coupler. This measurement ensures that the coupler is centered in the range of travel.

Rebuilding a 1964 Plymouth Steering Coupler

I assume this is the hole you’re referring to. I haven’t measured it, but I will now. It looks to be close.