The brake drums, not the shoes, are what's almost impossible to find. Unless the drums are terribly scored, don't do much machining on them. Relined shoes aren't that difficult to find, or if your shoes aren't damaged, they can be relined. Keep the brakes adjusted properly and unless you're running max gross weight you should be able to stop safely without power boost with good linings. Original equipment style Hydrovac boosters are available, at some NAPA stores, even.
Jerry
