This hydraulic switch is the right one for just about every British car made in the 1940s, 1950s, and early 1960s, including MGA, Triumph TR3, TR4, MGB, and Healey. It is also the correct switch for early Volvos, possibly Alfa-Romeos, and other cars. It has a 1/8" pipe thread and is pretty close to a universal switch.
Contact us if you are not sure if this is the right switch for your car. We also sell a variety with push-on spade, or Lucar, terminals.