If you are building converters for the first-generation IBM 122-key terminal keyboards, their original cables have large 5-pin DIN connectors with 240 degree (sometimes called 270 degree) pins.
Here are 2 types of sockets that will accommodate these plugs: black ones that make a new end connector for a cable (they slide out of the plastic shroud and open up to expose the pin connections), and the silver ones that surface mount through a hole in a box or panel.
I will sell them for $2 each plus $2.50 shipping (domestic US) and will combine shipping for multiples.
For now, I will sell a maximum of one of each per customer in order to spread them around, in case several people want them.
PM me if you are interested.