Need a little schooling on steering couplers

When I removed the steering column on my '62 Valiant recently, the steering coupler sort of fell apart.

Should I rebuild or replace it?

Can anybody suggest a better replacement? Something a little more heat resistant? (It's a V8 conversion and the coupler is near the exhaust manifold.)

And are there supposed to be 2 of the little retainer thingies inside the coupler, or only one?

Thanks a lot!