Shimano XT RD-M786/781 & SLX RD-M675/670 Bracket Axle Unit "B" fit for SLX RD-M675, RD-M670, Deore RD-M610 Includes B-axle assembly (frame mounting bolt) XT RD-M786, RD-M781 OEM part Shimano Miscellaneous Rear Derailleur Parts