Fits Sierra 1500, Sierra 1500 Limited, Sierra 2500 HD, Sierra 3500 HD, Silverado
5.8 FT BOX, round, upper. 6.6 FT BOX, round. 6.6 FT BOX, round, upper. 6.9 FT BOX, round. 8 FT BOX, DUAL REAR WHEELS, round. 8 FT BOX, round. 8 FT BOX, round, upper. 8 FT BOX, SINGLE REAR WHEELS, round. 8 FT BOX, W/DUAL REAR WHEELS, round. 8 FT BOX, W/O DUAL REAR WHEELS, round. W/O CARBON COMPOSITE BOX, round, upper.