The main difference in the gears is the thickness of the Intermediate gears. The MK3 gear is approximate 0.444" thick where the pre-MK3 gear is 0.5" thick. The gear faces are also different. The number of teeth on the gear and the sprocket are the same for both gears.

The current price for the Pre-MK3 gear (part # 06-1077) is $117.00.
The current price for the MK3 gear (part # 06-5667) is $79.93.
Prices are current as of 02/12/21.

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