I'm swapping a CBR600 F2 arm into my 500. The axle is the same diameter as our SOHC4 bikes, so it only needs spacers on that end to center the wheel and it's almost the same width at the pivot bolt so narrow spacers are all that's needed. The axle pivot bolt is larger on the CBR arm, so it'll need custom bushings to make up the difference. The arm is also 2" longer than a 500 unit, not sure the difference compared to a 750, but I'm having mine shortened to retain stock geometry. Also needs shock mounts welded on if not going monoshock and a brake stay added if not converting to a disc or cable brake.
I was under the impression that 500/550/750 arms are all swappable, so it should be the same mods to fit into a 750. It's a lot of work and not as cool, but still cheaper than a calfab arm and easier to find than a dresda arm. It's a near weight neutral mod too, might shave a few grams off but the stiffness gained is significant.
