This is a new dual brake/clutch master cylinder for 58 to 65 Austin Healey Sprite MkI & MkII and 62 to 65 MG Midget MkI with front drum brakes. It also fits MGA, TR2 and TR3 to TS13045. Cross Ref.# 180-670, 39121, GMC109, L39121, LM10006, AJH5128,180-673,180-672, LK36944X, LK36944