I don’t see why the 52-1 and the 52-2 would use different firing pins (different extractor yes, definitely) but the firing pins should be the same.
Numrich carries original and reproduction pins however both show out of stock at the moment.
Maybe if I have time tomorrow I could pull and compare them to a 5906 pin and see if that could be made to work.
I suspect there are Model 52 firing pins out on the market somewhere to be found. This is not a weak part that is prone to failure, I would say that a broken on is a rare event.