Used on the following models:

Star Trac
9-3561-MUSAP0 Treadmill
E-TCi Treadclimber - 9-9121-MUNBPO
9-9021-MUSAP0 , E Series - E-TR9021
9-9023-MUSAP3 , E-TR9023
9-9041-MUSAP0 , E-TRx9041
9-9043-MUSAP3, E-TRX9043
E-Series 9-9051-MUSAP0
E-TRe - 9-9031-MUSAP0 - 2008 (TRENxxxx-xxxxxx)
E-TRx - 9-9051-MUNBP0 - 2010
E-TRxe - 9-9051-MUSAP0 - 2008 (TREXxxxx-xxxxxx)
S Series S-TRc - 9-3581-MUSAP0 G2 - 110V Ver. A (TRSC)
S Series S-TRc - 9-3581-MUSAP0 G2 - 110V Ver. C (TRSC)
S Series S-TRx - 9-3553-MUSAP3 (G1)
S-TRx - 9-3573-MUSAP3 (TRSXxxxx-Lxxxxx)