SumoSprings Helper Springs. 2005-2023 Ford F-250 Super Duty. 2005-2023 Ford F-350 Super Duty. 2005-2023 Ford F-450 Super Duty. 2005-2023 Ford F-550 Super Duty. Handmade from micro-cellular polyurethane, they are designed to stabilize weight transfer and limit body roll while decreasing vibration, stabilizing sway, and softening harsh rebounds.