husky drvr
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I believe this site has a copy of the workshop manual 124. This manual covers the Rapier steering box in section J. The rapier seems essentially the same as the Alpine except for ratio and the adjustable reach top end.
Chrisp Rapier,
In case you are wondering about installing an Alpine steering box with the adjustable column, no matter how much you try, the column wont adjust short enough to match the Rapier wheel position.
Since the electric power steering kits came about, it MIGHT be possible to use the Alpine unit and adjust the upper and lower column sections to achieve the proper wheel position. I haven't heard of anyone actually trying and reporting.
Filister,
I'm reasonably sure the steering ratio is determined steering wheel to road wheel. That would include the steering arms which are different -Rapier to Alpine.
It's possible the theoretical ratio is only different due to those arms,then again,maybe not. Only comparing parts books would shed some light here.
The sII Rapier, if stock, should have some large front drum brakes. The steering arm at the wheel is different from the Alpine's arm. Even the early Alpine's style front spindle steering arm is different from the Rapier's arm.
Just some random thoughts,