When the MX first came out SB used a black coloured belt. It was defective and shed particles that caused bumps in the PE, bad bumps.
They sent out replacements with a brown coloured belt which did not do that.
So the mount is somewhat sensitive to the type of belt and you would have no way of knowing if a particular belt will have that problem or not.
Best to pay the price and get original parts otherwise you could be redoing it anyway in 3 months time when you get lousy PE.
Greg.
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