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Deore
Which part number? Find the EV on https://si.shimano.com/#/en/search/Series?name=DEORE&generation=M6100&type=MTB and the parts will be described.
Two black spacer-seeming plastic discs in the box with new Deore Boost chainset. What are they for? Filling in the gap between bb and crank arm? I’ve put them on either side but they don’t seem compressed at all