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Brian welcome to SMF. Somebody has started manufacturing GOSM's I believe maybe you can check out a new one and see what company is now making them and get in touch with them for parts
I live 8 miles from where GOSM operated there plant. Theres a guy here in Galena who bought some of the stock when they shut down. I can get the burner and shroud for the small GOSM like mine. He has some burner assemblies that have the 4" cast brass burner too.
Im got to be away for a few days. storm took the roof off my apartment and the cieling came down computer took a bath. Writing this on a friends computer.