Hy lastchancetowing, Geoff wants to know the brake shoe width, I believe 4" width is Bendix (crossover brake line is inside the drum) the wider shoes are Wagner brake systems I believe (crossover brake line on backing plate). Your pictures are of Bendix brakes, if you damage the crossover line DO NOT THROW AWAY THE TUBE NUTS WITH THE DAMAGED LINE, these nuts have a different pitch than the standard tube nuts and are hard to find. You can transfer the Bendix nuts to the new crossover line you fabricate and you'll only have to make one flare on one end, hope that helps.
