Not that I have looked into a 750 sport conversion but you may save yourself a bunch of agro by getting a whole ( late 90's ) ally swing arm and wheel/disc/caliper of a 900ss. And , if the 750 sport has M1R forks and you use a ducati front wheel as well you will have to loose 4mm off either the inner fork leg ( where the speedo drive bears against it ), the speedo drive or a combo of both as the Ducati 17" wheel needs to go 4mm to the left to line up properly . Give some thought to the speedo drive as not all 17's are the same and they are diff to the 16" speedo ( Not just the gearing but the shape/ fitment as well ). A bonus to using the duke front wheel is that with a readily available set of brackets 4 pot Brembo's will fit onto either 300 or 320mm disc's (invert the bracket ) and line up fine ........after you have moved the wheel 4mm to the left ( not as big a drama as you might think ) and the standard axle will work with a change of bearing size ( depending which model of duke you get the wheels off
Another option for the speedo , depending on local laws , you may be able to fit one of then relatively cheap GPS on screen display read outs . I have one on my Capri as the old standard speedo tells different sized lies every time I looked at it ...........unless it really can do 125mph 
.... works a treatOh , you only need to post in one forum , some of us are so despite for entertainment we will read anyything new
