If these are the little green connectors, they are probably copies of the ones that Phoenix Contacts makes. I'm pretty sure the major electronics houses in the US, like Newark, Mouser, Digital, Allied, Carleton-Bates, etc. all sell them. This might be one place to start:
https://www.phoenixcontact.com/onlin...Ab2-_AOIp6Bs!/
Sorry for the ultra-long link. If that doesn't work, search Phoenix Contact for PCB Terminal Blocks.