Pfzilla: Thanks for your input. I had already seen those on Ebay but they are not the same as originals in my car. I think they are for earlier GM models, perhaps even those with rear doors.
My parts book shows a specific P/N, 4709879, for "1957-60 All, front door". This switch has two prongs for connecting the two applicable wires. Those on Ebay do not exhibit this configuration.