The blocks are OEM equivalent but they don't fit my switch. I have a 10 year old Shimano Deore 8 speed narrow cage and they were 1.5mm thicker. Although I haven't used them, they appear identical to mine except they are not stamped "narrow". A few local bike shops can't find a source for the narrow wheels either. So if the top part gets wobbly enough, it's either a new derailleur or a new bike.
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