Not sure if i am missing something here but dont those black sticky back plastic stickers stop the dirt getting into the diff...??? I owned a 501 for over a year and the thrust race used to get full of dirt before the diff itself.
I used to pack the out drives with those red spongey spacers and this helped alot but still, the thrust race would always get dirty befor the diff...
Not sure these covers are needed to be honest.
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Neil Adamson
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