722-012 Dorman Leaf Spring Hanger Front or Rear New for F350 Truck Ford F-350 137"wheelbase Chassis Cab
$91.81ea JC Whitney-La Salle,IL via eBay # 125152673791
https://www.amazon.com/Dorman-722-012-Ford-Truck-Bracket/dp/B0048YMC5A $58.51ea
listed as for 2-1/2"wide spring,maybe thats what you have not the 3"wide spring..this is going to take some research, at least Amazon lets you return it
I ran your VIN thru partsmatch and it didnt come up..missing a character or number? confirm your VIN again if you can..
FWIW Best of luck Sonny.