Trying to find connectors

Anyone know where I can find connectors like in the picture. It's from a training lab, but I want to make my own lab. It's like a 4 pin breadboard and I'm guessing that it is pcb mount.

The Lab is a Elenco XK-700 if you want to see what the whole thing looks like.

Thanks,

Jeffery

I believe that's a Tie-Point Block Single from 3M p/n: 923297-I. Here's a link to 3M's Solderless Breadboards and Accessories catalog:
https://media.digikey.com/pdf/Data Sheets/3M PDFs/Solderless Breadboard Acces.pdf

Mouser sells them. 20 pack for $11.34

creakndale