Interesting thing... The rx7 tail shaft seems to have new uni's and is the right length... Only rtouble is the diff flange bolt holes are spaced correctly on one parallel but not the other.

How troublesome would it be if I drilled the diff flange holes out until they are big enough that the furthest out edge of these holes lines up with the furthest out edge of the tail shaft holes evenly. Thus the bolts would not be snug all the way around but would still be on one opposing side to each other.

So instead of a 8mm bolt in a 8mm hole I'd have a 8mm bolt to one side of a 10mm hole.

Cant see any other way of moving the holes out precisely...

Or I could just suck it up and get another tail shaft made.