Master Cylinder Rebuild Kit 17MM Airheads 1976-80, Dual Disc Features: Machined and hard anodized aluminum piston Complete with all parts needed to perform a quality rebuild of the under-tank 17mm master cylinder Has correct o-rings to fit 76 & Later reservoir New main cup seals already installed on piston providing an easier assembly Fits all dual disc models from 1976-1980 except R65 Replaces BMW OEM part# 34311234925 that is longer available from BMW
