I am not quite sure if the Ford and Chevy Master brake cylinder is the same......
...but if it is..... I had a hard time finding a rebuilt or a kit from Malmberg in Ottawa..... they recommended John Stuart from Stoney Creek which I was already familiar with.
I had Stuart sleeve my master with SS for about $190......
I regularly cruise the web and Ebay.... some kits have been offered but always for the smaller trucks (1/2 ton) using the 1 inch bore.
The CMP M. B. cyl. I have seen are all 1 1/4 bore.... Delco Canada.
By chance I stumbled on a site called.....
http://www.chevsofthe40s.com/ and in their catalogue they have kits for the 1 1/4 inch bore master cylinder listed as a 1 1/2 ton chev part....also kits for the various size wheel cylinders for CMP and HUPS....
Interestingly they also have the brake cables... emergency cable for what I think will fit the CMP..... only time will tell as I intend to order some for my truck and this is the only likely source so far.
Will need to search the catalogue in greater details......
Bob C.