Don't think that's 55, which comes with aluminium cup? 52 maybe?
52 maybe?
BB-UN54 is the plastic NDS cupped contempory of BB-UN55. BB-UN52 seems to have been issued with either plastic or metal, not sure if that's a change over time or a difference between OEM and aftermarket.
@gbj_tester started
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Don't think that's 55, which comes with aluminium cup? 52 maybe?