Just put a new tyre on my 1997, all went well, grease on the axle & spacers, coppaslip on the threaded bolts, looked at the calipers, looked at my girlfriends 1990 250 Spada - SURPRISE !!!!! The calipers are the same (Oh no! my 1997 is a parts bin special - left over pre RC45 motor, CBR forks, 1990 250 brakes...... oh the shame ......) Probably has a swingarm of a 1990 650 Hawk too...............
rear swing arm is different on our bikes, 3rd/4th generation, as well as the newer stuff. Hawk (which I owned a while ago, had a different looking set-up.) Hawk was a way lighter bike, viffers are heavy bikes.