If you can't find one, this is an easy project for a blacksmith. Try a pioneer village or similar. Most blacksmiths like a different project to work on during display days. They usually make a lot of "S" hooks for the kids. I would offer but I don't have my forge or hammers any more.
Neil
1945 CCKW 353 Fire Truck to German Kfz72 Radio Van conversion. http://716heer.org
Houston Texas