BEL221166 / 221166 - Application Notes Rear Shock (Each) - (Desired Lowering Amount) 05-06 Silverado 1500 2WD - Standard / Extended Cab - Short Bed (with Factory Front Torsion Bar) - (5-6”) 04-06 Silverado 1500 2WD - Crew Cab 4-Door - (6-7”) 03-06 Silverado 1500 SS 2WD / Sierra Denali (AWD) - (2-4”) 99-06 Silverado 1500 2WD - Standard / Extended Cab - Short Bed (with Factory Front Coil Spring) - (5-7”) 75-91 C30 Pickup 2WD - Crew Cab / Dually - (1”) 00-06 Tahoe / Yukon / Suburban / Yukon XL - 2WD (Without Factory Auto Ride Shocks) - (2-4”) 00-06 Avalanche 2WD (Including Z71) - (Without Factory Premium Ride Shocks) - (2-5”) 00-06 Avalanche 4WD (Including Z71) - (Without Factory Premium Ride Shocks) - (2-3”) 00-06 Tahoe / Yukon / Suburban / Yukon XL - 4WD (Without Factory Premium Ride Shocks) - (2-4”) 94-99 Ram 1500 2WD - Standard / Extended Cab - (2-4”)