Pick up this replacement backup light switch for your 1970-1973 Mustang with a Toploader 4-speed transmission and factory Hurst shifter. The Hurst 4-Speed Backup Light Switch is a direct fit since it is made to be OEM style. This is only meant for a Toploader 4-speed transmission and factory Hurst shifter. Back-Up Lamp Switch Retainer is also required (D0ZZ-15541). Note: Modifications may be required to fit non-factory Hurst shifters.