Feel the unique rhythm of every trail with this Extra Heavy Duty Spring Kit. These heavy duty springs deliver supreme performance in all conditions and are engineered specifically for passenger riding or heavier riders. This Accessory is Designed to Fit the Following: 2021 650 INDY VR1 129 , 2021 650 INDY VR1 137 , 2021 650 INDY XC 129 Launch Edition , 2021 650 INDY XC 137 Launch Edition , 2021 850 INDY VR1 129 , 2021 850 INDY VR1 137 , 2021 850 INDY XC 129 Launch Edition , 2021 850 INDY XC 137 Launch Edition ,