Idler Pulley For John Deere Z710A Z720A Z910A Z920A ZTrak Mower  Premium Quality Replacement Part  Deck Idler Pulley Compatible with Toro TimeCutter Zero-Turn Models : 74401 (Z 17-44) -  44" (SN: 220000001 - 240999999) (2002-2004) 74405 (18-52 ZX) -  52" (SN: 230000001 - 240999999) (2003-2004) 74406 (ZX 440) -  44" (SN: 250000001 - 280999999) (2005-2008) 74407 (ZX 525) -  52" (SN: 250000001 - 270999999) (2005-2007) 74501 (Z 16-44) -  44" (SN: 210000001 - 220999999) (2001-2002) 74502 (Z 16-44) -  44" (SN: 220000001 - 230999999) (2002-2003) 74601 (Z 17-44) -  44" (SN: 210000001 - 230999999) (2001-2003) 74602 (18-44 ZX) -  44" (SN: 240000001 - 240999999) (2004) 74603 (ZX 440) -  44" (SN: 260000001 - 270999999) (2006-2007) Compatible with Exmark Models : FMD52 -  52" Turf Tracer Hydro Walk-Behind  (SN: 115000 - 129999) (1996) FMD522 -  52" Turf Ranger Front Mount  (SN: 115000 - 129999) (1996) FMD523 -  52" Turf Ranger Front Mount  (SN: 130000 - 319999) (1997-2001) FMD523 -  52" Turf Tracer Hydro Walk-Behind  (SN: 130000 - 149999) (1997-2001) FMD524 -  52" Turf Ranger Front Mount  (SN: 320000 - 599999) (2002-2005) FMD524 -  52" Turf Tracer Front Mount Deck (SN: 000600000 - 000999999  312000000 - 312999999) Compatible with John Deere Ztrak Mower Models : Z710A, Z720A, Z910A, Z920A, Z925A, Z930A, Z950A, Z960A, Z970A - ( SN: 020001- ) Order Includes : 2x Idler Pulley : TCA19779 TCA20092 Width: 33․3mm - 1.31 in Inner Diameter: 16.1mm  - 0.63 in Outer Diameter: 142.1mm - 5.59 in