I don't believe that you can buy UL listed breakers for their old panel. The only ones I've seen for sale are sold at the "Big Orange Box" store, Made in China, and don't have a UL.
(Although a few showed up in Florida with counterfeit labels about a year ago). This should give you a little leeway?
You know the rest of it.
Print off the New York FPE, the link's here in the threads.
If you look way back, sparky66wv did an actual (don't try this at home) test with these, I think.
The best thing about them is the glowing feeling you get when you throw one of these, or a Zinsco, into the dumpster [Linked Image]