This belt works to transfer power to the needed assemblies. Belt, Conveyor Auger, Shoe Fan Drive. 7/8 x 272.25 in. S550 STS, S660, S660 Sts, S670, S670 Hillmaster, S670 Sts, S680, S680 Hillmaster, S680 Sts, S685, S685 Hillmaster, S685 Sts, S690, S690 Hillmaster, S690 Sts.