Brand: AIM Sports
This is the same mounting kit included with the AiM MX-UTV Belt Temp Sensor (Part No. MC-355), as well as AiM MX-UTV dash kits. If your sensor has come loose from the belt guard, this kit will hold it in place. (Note that if your sensor has gone missing, the replacement sensor will include this mount kit.)
The kit includes the threaded collar (1/2-28 UNEF female threads, 5/8-24 UNEF male threads) and two thin jam nuts (1/2-28 UNEF female threads). One kit mounts one sensor.
Note: AiM calls this kit a "bracket".