@Chuck Sartor posted:One of the reasons for so many part numbers for one lamp is at the dawn of MTH, they used to sell them with the connector plug attached to the bulb. Sort of a custom fit for each diesel locomotive. So each different length of wire needed, the same bulb acquired several part numbers. Now add if it was a double bulb set for twin headlights, same senario different lengths of wire created a new part number. But all-in-all, it is the same bulb. Just splice onto the existing plug. In most cases it is easier too, not having to re-route the entire bulb and wire.
If you don't have the connector ( or found one of your wires squished under the body mounting post of an RS-27 )
search "5264 battery connector" or "5264 connector" on ebay for connectors with or without attached wires.