Signature Series Mounting Kits are vehicle-specific and are for use with the Signature Series Fifth Wheels only. The Reese Elite Series Rail Kits are designed for use with the Elite Systems only. Fits:01-06 Chevrolet Silverado 1500 HD 6.6 ft. Bed, 2 & 4 WD2007 Chevrolet Silverado 1500 LD 8 ft. Bed, 2 & 4 WD (Classic)99-06 Chevrolet Silverado 1500 LD 6.6 ft. Bed, 2 & 4 WD2007 Chevrolet Silverado 1500 LD 6.6 ft. Bed, 2 & 4 WD (Classic)01-06 Chevrolet Silverado 2500 HD 6.6 ft. Bed, 2 & 4 WD07-10 Chevrolet Silverado 2500 HD 6.6 ft. Bed, 2 & 4 WD (New Body Style)99-04 Chevrolet Silverado 2500 LD 6.6 ft. Bed, 2 & 4 WD07-10 Chevrolet Silverado 3500 HD 6.6 ft. Bed, 2 & 4 WD (New Body Style)01-06 GMC Sierra 1500 HD 6.6 ft. Bed, 2 & 4 WD2007 GMC Sierra 1500 HD 6.6 ft. Bed, 2 & 4 WD (Classic)04-06 GMC Sierra 1500 LD 5.8 ft. Bed, 2 & 4 WD2007 GMC Sierra 1500 LD 5.8 ft. Bed, 2 & 4 WD (Classic)99-06 GMC Sierra 1500 LD 6.6 ft. Bed, 2 & 4 WD2007 GMC Sierra 1500 LD 6.6 ft. Bed, 2 & 4 WD (Classic) 01-06 GMC Sierra 2500 HD 6.6 ft. Bed, 2 & 4 WD 07-10 GMC Sierra 2500 HD 6.6 ft. Bed, 2 & 4 WD (New Body Style) 99-04 GMC Sierra 2500 LD 6.6 ft. Bed, 2 & 4 WD 07-10 GMC Sierra 3500 HD 6.6 ft. Bed, 2 & 4 WD (New Body Style)