SXR 800/SXi 750 Flywheels. Same?

I'm seeing same part number for all sxr flywheels including 03, but I'm surprised to see it's unique to sxr and there are a few different part numbers for the different 750's.

This surprised me because I thought they were all the same other than the extra internal taper on the really early 750's.

Anybody know what the physical differences are?
 
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dfw
Shaft tapers are the same on all 650-750-800. Early 750 flywheels were countersunk at the mouth of the taper so they fit 650s and early 750s.
 
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