The first number is the diameter of the brake drum where the shoes contact. The second number is the width of the lining. Are the brake shoes damaged to the point they can't be relined? The simplest way to assure you get the right parts is to rebuild what you've got. There is a huge quantity of brake lining material available on Ebay, plus the rivets needed to install new linings. relining brake shoes is not rocket science, even if bulk lining material has to be cut to the right length and rivet holes drilled in the right places. Bonded brake linings can be removed by heating the shoes with a torch to loosen the glue they're attached with, and riveting new linings on in their place. Most older brake shoes are drilled for rivets, even if they have been reconditioned with bonded linings.
Jerry
