A: Harry, documentation of prewar part numbers is pretty spotty, but I checked Greenberg’s Guide to Prewar Parts and was able to find the information. It lists the following for the 315:
– 88-2 binding post nut
– 152-33 lamp
– 315-6 top stringer
– 315-7 wire brace
– 315-11 insulation plate assembly
– 315-15 lamp lead assembly
– R-68 red jeweled cap
Hopefully, Harry, this information will help you get that great old bridge flashing again!