I know these haven't been made in a long time, but if anyone has a source or has a few lying around, I need 3 pieces. I'll pay $20 for them plus shipping. I'm looking for the clip with the two prongs on the end, NOT the kind with the round tab sticking out.

This is for an estate where they're trying to keep everything original. It is also on a bank of 16 units and they're on a dimmer, so I don't want to convert the whole thing over.

Thx