Klixon PA series circuit breakers for P-51

[Yak3]

Hi, we're continuing to have issues in tracking down any Klixon PA5 and PA15 circuit breakers for our front switch box assembly. Having called various outlets and spent an hour or two communing with the sage Google, I have drawn a blank on locating a supplier, or even any details on the parts. I assume from their appearance in the manual that they are simply an automatic-reset type of breaker? It may be of course that folks are using an alternative part these days, the modern Klixon automatic-reset breakers are the PSA series and are generally available.

Does anyone have access to a P-51 that they could have a look at and see what has been used, or even better have any first-hand experience in obtaining breakers for this application?

Thanks