Overdrive Inhibitor switch for A-Type, D-Type and J-Type overdrive units for Austin Healey BN1 to BJ8, Triumph TR3, TR4, TR4A, TR250, TR6, GT6, MGB, MGC. Reverse light switch for; Jaguar 1961 to 1987, MGB, MGC 1967 to 1980, Spitfire 1963 to 1974, GT6 1966 to 1973 and TR3-TR6. Lucas SMB499