The CVT cover is the same
Starter reduction gear is the same
Secondary clutch is the same
Primary clutch is the same
Crankshaft is the same
The crankcases are same 03-04 and 05-06 - there was a change in the crankcase between 04 and 05, but the rest of the parts are the same 01 to 06 - it's possible the only change in the crankcase was the color, but Polaris has discontinued the 03-04 crankcase while the 05-06 is still available - they did not supersede the 03-04 to the 04-05 part number, so the change may have been major.
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