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Old 03-29-23, 12:31 PM
  #13  
Shimagnolo
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The part the OP is looking for is called the "B-Axle Unit".
Here is an eBay posting for the equivalent part for an RD-M772:

https://www.ebay.com/itm/35464569849...item529287e7c2

Now whether they use the same part, I do not know.
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