2 nuts on fork top, stainless steel
27mm. 20Tpi
BSA A50 (1962-1965), A10 (1950-1963), A65 (1962-1965)
BSA B31, B32 (1946-1959), B40 Star (1961-1967), B33, B34 (1947-1963)
BSA C10 (1948-1953), C15 (1959-1967), C11/C11G (1948-1958), C12 (1956-1958)
BSA M20, M21 (1946-1963) A7/10
B31/32/33/34, M20/21 , C15 and C11G
Part numbers: 65-5331, 65-5332
