22-1221 Chevy/GMC Silverado, Sierra 1500 Rear Leaf Spring (2/1 Leaves) 1999-2010 SRI No. 22-1221 OEM No. 15033928 Measurements (A): 32" (B): 32" (C): 6 7/8" Pack Thickness: 1 3/4", Spring Width: 2 1/2" Spring Capacity 1,425 lbs