Application: AM133924 Double Deck Drive Belt Tightener Pulley is suitable for John Deere LX280 LX288 LX289(48C deck) GX255 GX325 GX345 GX355 48C and 54C Mower Deck 2. Function: Replaces the aging double pulleys on mower decks to help maintain a safe ride and make mowing easier. Material: Constructed from heavy- duty steel with high strength, it is sturdy enough to resist impact and meet your need, durable to use for a long time. Replacement: Directly replace JD OEM part number: AM133924, AM127594, AM125668, Manufactured from OEM Specification.