BNIB, Rare Shimano Deore LX RD-M581 Long Cage (GS) Rear Derailleur. Made in Japan , Sports Equipment, Bicycles & Parts, Parts & Accessories on Carousell
Shimano RD-M581 Cage Plate SGS Y5W498020
How To Rebuild a Shimano Deore LX M570/M571 M580/M581 Derailleur - YouTube