43-1263HD Ford F250SD, F350SD Rear Heavy Duty Leaf Springs (6/1 Leaves) 1999-2007 SRI No. 43-1263HD OEM No. None Measurements (A):25" (B):33 1/4" (C): 7" Pack Thickness: 3 1/4", Spring Width: 3" Spring Capacity 4,400 lbs