I would recommend going with a harness designed for a 1960-61 hood. I don’t remember where I bought mine, and I thought it was for a 1960 – but the wires turned out to be too short and I had to splice new lengths in to get it to work. I’m not sure anyone sells the sockets by themselves. The only unique feature I’m aware of is they have a straight bar molded in on one side that aligns with a slot in the lamp housing.
Here’s the Chevy Duty version:
http://www.classicparts.com/1960-61-...ctinfo/52-511/