This swing arm has a pivot 16mm slide in bushings 1 1/2" long that you can remove = you can make two bronze inserts to your axel size 1 1/2' long. This swing arm was not made for a SOHC 750 as builder worked on many KZ and Suzuki in his shop. May be I can find a bronze boat propeller shaft at my friends scrap yard and saw off 6-10" . I will mount a flat topped 6 1/2" wide street tire that I have on a stock rear F-rim with stock disc brakes and gear all f-model and put on my 750A, make spacers and pivot inserts for 750A size bolt , always wanted to hold a left front brake on a rear wheel brake for the line lock on the two step. Stock arm F is 10 7/16" spread.