Premium Quality Replacement PartIdler PulleyFor Husqvarna Models:Wh 4817 E (968999238) (2005-08) Lawn MowerWH 4817 EFQ (968999252) (2005-08) Lawn MowerWH 4817 EFQ (968999252) (2008-08) Lawn MowerWH4817 (2008-08) 966947002 Lawn Mower: Commercial Walk BehindWH4817 (968999238) (2005-08) E Lawn Mower: Commercial Walk BehindWH 5219 EFQ (968999253) (2005-08) Lawn MowerWH 5219 EFQ (968999253) (2008-08) Lawn MowerWH 5221 EFQ (968999599) (2008-08) Lawn MowerWHF 4215 ETS (968999127) (2001-12) Lawn MowerWHF 4215 ETS (968999127) (2002-02) Lawn MowerWHF 4215 ETS (968999127) (2002-09) Lawn MowerOrder Includes:2 x Idler Pulley: 539103257 510057101Width: 1.75″ | 44.45 mm Inner Diameter: 5/8 ” | 15.8 mm Outer Diameter: 5 3/4″ | 146.0 mm **