Steering Stem Head Adjuster Sleeve, for use BSA models: B31,B32 (1946-59), B33,B34 (1947-63), A7,A10 (1947-62), A50,A65 (1962-68), M20,M21 (1946-63)
O.E.M: 67-5023
( Note: Top Nut to fit is 28939 (with damper hole) or 28933 (without damper hole))