You can also get a standard cluster one and get the shaft and housing shortened. I did it once with a 72/74 2 speeds one with the one I had on my standard cluster before get completed all the parts to the wiper motor conversion

https://www.ebay.com/itm/122379770667


Need to be dissasembled and shortened at the inside end, not at the knob end.

Can't tell for sure how tricky is on a 71, but on 72/74s is fairly easy.