The 41A6569 Safety Sensor Bracket kit includes everything you need to mount the 41A4373A safety sensors. These brackets are only compatible with the 41A4373A safety sensors (not included). The 41A4373A safety sensors were used with Liftmaster, Chamberlain, and Craftsman operators from 1993 to 1997. The 41A4373A older style of sensors can easily be identified by the long screw that goes through the center of the sensor and attaches the sensor to the bracket. The 41A6569 Safety Sensor Brackets can also be attached to the wall using the included lag screws or to the floor using tapcons (not included).