Sorry for not understanding exactly what you mean by “road lamp”. Can you please describe the part in a little more detail? Do you mean headlight, or fog lamps, or spotlights or some other type of light? Again sorry for the language issue but I have not heard the term road lamp before.
I am new to this club and I see that your post is about 4 years old. Anyway I had a 1954 Mercury and I bought loads of spare parts for the car and had plans for many changes. I bought the factory option road lamps that are specific for the 1954 Mercury. They are in need of restoration but I believe that they are complete. I have the switch, the floor dimmer switch which is different, the wiring and I do believe everything that is necessary. But as I said before they do need to be restored. If you are interested send me an e-mail.
John Polizzi email@example.com