This electrical starter solenoid relay switch is designed as a direct replacement for select and motorcycle models.It operates at 12V and is compatible with part numbers including E5DF-11450-AA, E5TZ-11450-A, E79F-11450-AA, E79F-11450-AB, E7TZ-11450-A, E7TZ-11450-B, E89F-11450-AA, E99F-11450-AA, E9TZ-11450-A, E9TZ-11450-B, SW1951, SW1951A, SW1951B, SW1951C, Prestolite 15-437, 15-450, SAZ-4201, ACCUMAX 10A-F1035, ACCURATE 7-1035, AMETEK 15-450, ARROWHEAD SFD6009, J & N 240-14004, PRESTOLITE 15-437 15-450, and WAI 66-203.Fits Mustang (1985–1993), F-250 (1985–2004), F-450 Super Duty (1999–2004), F-550 Super Duty (1999–2004), Bronco (1985–1996), Bronco II (1985–1990), Escort (1984–1990), and other listed models.Includes one (1) solenoid relay switch.