Borgeson Mopar Steering Shaft Coupler
They're not the same as stock, but not that hard to adapt, either.
On my '62 Valiant V8 conversion, I only had to shorten the steering shaft a little bit and weld up a hole in the shaft into which a rolled pin had gone.
Just make sure you buy the correct diameter Borgeson coupler with the right ends.
It gave me a lot more clearance between the exhaust manifold and the steering coupler, plus it is a lot more positive than the old rag box coupler.