I have been told some of the 47 bellhousings will work, but I have never seen one. You can get a modified bell housing from Jim Carter that has the holes drilled and tapped to mount your pedals. This will also bolt up to a SM420. If it is a working 1.5 ton this is a good match and they are not to difficult to find, rebuild or find parts for. You may have some starter gear issues as well. I lucked out and found one that worked on mine. You will also have to do some hack saw work on the floor board for the SM 420. The cross member may need to be slightly cut back as well. I needed to cut about a 1/4 inch off a ridge.
This has been discussed before, so do a search for more discussion.
I did this and am very glad I did.
