I know this is an old topic... but I came here and others likely do as well.
I have a 1963 C60 with 20" 10 bolt wheels. Here is what is current information as of 2012.
Accuride no longer makes a replacement wheel for this application. They will not do a limited run with holes to spec.
You are left with three options.
1. Replace your 20" tires with Chinese tires and have them mounted by an ever diminishing list of tire shops who will handle the Firestone RH-5 wheels.
2. Have custom rims drilled to your specs for hub pilot hole and bolt hole pattern. There is a business in Washington State that can do this
3. Have a custom shop cut your wheel centers out of the 20" wheels and weld them into 22.5 wheels. You still need to find narrow 22.5's, but that is easier than many other wheels.
Any other ideas? I am all out of them. I have chosen option 3 and found someone with experience doing this. It is done by professionals in the collector car and offroad world. Good luck to others - a friend is selling his 1955 1.5 ton because of the wheels!
