71 also does not have the index ridge that 72-4 has. 72-4 switches will not fit in a 71 frame without either filing the ridge off of the 72-4 switch or putting a notch in the 71 hole of the frame.
The longer switch that is in your car is probably a non-Rallye one.
I'll check. I might have a couple 71 2-spd switches.
if its just matter of filing something off which wont affect peformance or mounting then im ok with that
i cant see the ridge which you mean can i see a photo of that before i buy one and find out its delicate to do