One of these was used in my 1952 1/2 ton and one came from something else and I honestly can't remember but I remember I've had this since the 1960s. At any rate, I saw these in the attic this morning and if you're into repairing/restoring vacuum motors these could be just what you need. I know the one in the 1/2 ton was working when I removed it, but I also think it was leaking vacuum when it was turned off. Or something like that. Anyhow $10 plus actual cost of postage for the pair of them. One is Anco (from the pickup) and the mystery motor is a Trico.
I've been told the mystery motor looks like a 1955-57 Chevy (Bel-Air or other) and this could be correct. I don't really remember. Could have been a 1958 Bel-Air, and this probably was the same as the tri-5 Chevy would have been. Flat rate shipping in the USA looks like about $14.35 for both.