Steering conversion question

OK, I've acquired the manual gearbox and pitman arm for my Dart. Now I just need either a longer steering shaft, or shaft adapter.

Is Firm Feel the best (only?) place to get a steering shaft adapter?
I have not yet found another one out there.

Or - assuming I can find a manual steering shaft, can I replace just the shaft, or do I need to replace the whole steering column?

My car is currentl column shift..Does thing complicate things too much?