I'm building a bit of a bitsa to use up my stock of old parts. The plan is to use a rear wheel from a 750 K7. However the spacer on the bearing for the sprocket carrier (part no 42605-393-000) is missing. I have one from an F1 (part no 42605-300-000). I am assuming they will be different due to the different numbers. If any one is able to measure the diameter and length of the thick section of a K7 spacer could they let me know so I might be able to machine the one I have to fit. So if you happen to have one to hand please help me out it would be a great help.