Yer tis: ST2/900 on the top, 600 on the bottom... similar - apart from the sprocket cavity, and the slave cylinder fitting? I use the cases to testfit these: Ducati 600SS 600 SS M600 M750 750SS Monster crankcase case saver stainless race | eBay Ducati 900SS ST2 ST4 M900 916 749 999 1098 1198 crankcase case saver stainless | eBay (Shameless plug)