This is the brake failure switch for the brass bodied brake differential Valve assemblies. The brass bodies assemblies where the most common assembly used for this time period. Fits: MGB 1968 to 1974, MG Midget 1968 to 1974, Triumph TR250, Triumph TR6, Triumph Spitfire 68 to 75 up to FM40000, Triumph GT6 1968 to 1973
