Anyone know where you can find the washers that fit at the top of the post on the older front truck assembly on the Big Hauler 4-6-0 Locomotive? There is silver washer with two small holes for the wires to pass through, that sits on top of the post and a black one with notches for the wires that sits on top of the spring. Bachmann doesn't seem to carry these any longer. I need several of each. Thanks!