The steel washers snug up to the shoulder of the bolt to stop the bolt from going in too deep into the body and the rubber washers should go on either side of the belt attaching piece (if you have eight in the kit, 66 does) or on the inside of the attaching piece. Assembly order, bolt (rubber washer), belt attaching piece (does it have a name), rubber washer, steel washer - body. That's the theory, but on the line it may have been put on at the head of the bolt. Also, there is supposed to be a small ring of strip calk between the steel washer and the body, that's the theory.
Jim