Vehicle Compatibility: These SumoSprings are specifically designed to fit your 2007-2025 Sprinter 2500, 1975-2002 E150, and 2003-2025 E350/E450 SuperDuty (2WD Only), ensuring a perfect fit and maximum reliability Progressive Load Support: SumoSprings compress under increasing weight to reduce rear-end sag, improve ride height, and maintain balanced handling No Air, No Maintenance: Made from closed-cell microcellular polyurethane, these springs don’t require airlines, compressors, or constant adjustment Smoother, Safer Handling: The progressive foam design dampens harsh impacts, minimizes body roll and sway, and boosts driver control Built to Last: Weather-resistant polyurethane resists UV, moisture, corrosion, and extreme temperatures — backed by a lifetime warranty