Bosch 491608 Belt Tightener Assembly for Dryer This part works with the following models: Bosch WTMC3300USCN, Bosch WTMC3321US This part works with the following model: Bosch WTMC3321US/05 This part works with the following model: Bosch WTMC3321US/03 This part works with the following model: Bosch WTMC3321US/02 Genuine Bosch Replacement Part