This repair kit fits the stepped-bore GMC227 brake master cylinder that was original equipment on all classic Minis from May 1985-on, and commonly retrofitted to 1979-1985 Minis. Please confirm your master cylinder is the stepped diameter (0.70"/0.75") one before ordering. Kits are not returnable once opened due to safety liability reasons. Ref: GRK1035, BAU5656EVA, LK11408, HMK143.