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Re the 94-97 VFR 750 swingarm, it is almost a direct bolt up job. You do need a 25mm OD x 20mm ID x 20mm length spacer on the right side (can buy one from McMaster Carr for $5), and you need a 1mm thick, flat washer with a 20mm ID on the sprocket side to align the shock mount. Other than that, no problems with the fitment. You do need a longer chain (112 link) and if you want to conceal the brake line in the arm as I did, you'll also need a longer brake line (about 1.05 metres).
The one other thing that people do with the 750 arm is use the VFR800 wheel (as I did). This is b/c the 800 wheel is 5.5" wide (5" for the 750 wheel) so you can run a 180 series tire. But you do need to notch out the wheel mounting face to clear the exposed bolts on the hub. Easy job though - you just use an angle grinder.
OTOH, the VFR800 arm is not compatible with the 900RR unless you do some serious machining of the frame and the arm. That would have been too much work for me.