Polaris OEM Snowmobile Rear Suspension .405 Torsion Spring Kit 2900098 Brand new, genuine Polaris snowmobile heavy capacity rear suspension square torsion spring kit, part #29000098. Sold as a pair with one RH and one LH Heavy Duty spring. Sold as a pair with one RH and one LH Heavy Duty spring. Sold as a pair with one RH and one LH Heavy Duty spring.