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Pastorbob I hope these pictures help.
The brakes are Shimano BR-M550 cantilever brakes. The parts as shown above (going from right to left) include the brake pad with a dished in captive nut, a dished out washer and a flat serrated washer. These parts go on the side of the brake lever closest to the rim. Then there is the brake lever, followed by the thin dished in washer and then the dished out bolt head.
In following pictures you'll see that the brake pad top is angled so that it clears the tire when the brake is applied.