Will the 5 on 6 1/2" Land Rover wheel pattern fit on the Ford 5 on 6" something, truck hub? Anyone have experience with the swap? Or what wheels are being used to replace the split ring Ford wheel?

 

Ford tonners of your era had 5 lug x 6 7/8" bolt pattern used on two different 17" wheel widths. No other vehicle used that bolt pattern in a flatly dished wheel. That bolt pattern was also used on pre 1934 Ford and Dodge 1.5 tons, and on WWII era military vehicles such as the Dodge Power Wagons. But they had more deeply dished Budd type wheel designs.

The stock tonner wheels most commonly had a locking ring two piece design known as the Firestone "RH" mount. This is not to be confused with the "widowmaker" mount that was technically called the Firestone "RH-5°". These "RH" wheels can still be serviced at truck type service centers while no reputable service centers will touch the "RH-5°" today. I'll link below cross section diagrams of each.

If your wheels are badly damaged and beyond use, or if perhaps you just want to have modern tubeless wheels, the only option I know of is to have custom wheels made. I see from your profile that you live on CA. The most commonly known source of custom wheels is Stockton Wheel. Wheel Vintiques is another source. A third that I like is available through your local Les Schwab Tire Dealer. Schwab has a contract with a company called American Wheel Specialist that is located in Pasco, WA. I've visited this company and have a set of their custom wheels and think highly of them. I have no other connection to the company. Since your stock wheels are so unique, I would suspect that American Wheel Specialist would need to pull the centers from your wheels to remount in tubeless rims. How the other companies would do this I don't know. BTW, nice ambulance. Here are the cross section diagrams of the rim designs. Stu