V-belt ride-on mower lawn mower HUSQVARNA AYP PARTNER RALLY For models : Rider Proflex 18, Rider Proflex 21, Proflex 21 AWD, Proflex 21 II, R422Ts, R422Ts AWD Dimensions: 1/2" x 60.06", 12.7 x 1525.5 Code: 57276015 Original code: 531009220, 535424701 HUSQVARNA AYP PARTNER RALLY