I've just started a restoration project on a Steyr Mod. 1903 M-S takedown sporting rifle and was wondering where I could source parts from? In particular, I'm looking for the forearm takedown pin and escutcheon plates. The butt plate trap door is also a bit bent up, so one of them as well.

This rifle also has a tang mounted pop-up sight, but is missing the inner peep aperture sight clip, so I'm looking for one of those a well.

Any suggestions out there?