Oooh, I remember those. Challenger made the same style with the cheesy little clip that's supposed to carry 30A. The clip is smaller than a Zinsco clip, and most of us smell $$$ when we hear a customer say "Zinsco"
When I ran across these I'd usually rework newer style twin/quad breakers in to make things happen due to the amount of failures I've seen with the clips.
The 2 pole is a Crouse Hinds MH230
And umm..... This
place wants $54.00 for one!