Marc........the brakes shoes lining is TOO THICK....all the specs I have seen says that they should be 3/16th NOT 1/4........as you have said these shoes were sitting on the shelf and have not been on the car........I assume you have compared these shoes to the ones that were on the car?.........they are the same size, ie, diameter/curvature?.........so the only answer is that there is TOO MUCH lining..........contact a brake specialist or a place like Kanter, Bernbaums etc & ask them if they were to reline your old brake shoes what thickness of lining would they attach?.........to your old brake shoes that do fit...........to me sanding with some sandpaper, bench grinder or whatever is just asking for trouble unless each shoe is set in a fixture that can accurately measure how much lining is removed........OH......and what are these linings made of?.........I hope they are not asbestos..........great stuff until you turn it into a fine dust.....like sanding...........my Oz 2 cents worth.....andyd