The black gear is a stock gear - its just the colour of the material which changed, i think the material has a little less silicone in it now from memory but to me it seems identical to the white gears.
The black belt is the touring car X-long low drag belt, the yellow touring car belt is too short to use with the dual pulley unless the slots are extended forward for the adjuster. So the only difference between the black touring belt and yellow buggy 3209 belt is the width, the black one is 1mm more narrow.
I have been using the buggy belt for a while now, but I am about to try the shorter/narrower touring car yellow belt with my slots extended & the dual roller. It all fits together fine still, will let everyone know if it is better/worse/same as before.
Chris
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