Only reason I suggested the Xray diff plates is that they seem to be a harder wearing than the ansmann ones. Ceramic balls really kick the crap out of the plates because they are a lot harder than the standard balls so the harder the plates the better.
B-fast diff kits work really well also I put one of those in my x-pro abotu a year ago and I have only re-built it twice in that time. Is a bit costly though.
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