600 bottom end based on the 600/750 gsxr-w, the 900 was based around the 1100 gsxr-w.
W wheels will bolt straight up, just the front rotors have a different spacing
Factory Pro is still producing race and tuning parts for old carb bikes. Here I unbox some goodies for a gsxr-w and bandit 400. Factorypro.com By the way I'm not sponsored by them. I'm just always trying to support people and companies still making stuff for old bikes.