There's lots of this stuff going on right now because of the UN (can't ship overseas) requiring licensing to export small arms and parts like N05 parts, Metford parts, Silkworm Missiles (same set of laws, believe it or not) etc. - try a supplier in the UK
- they seem to be less concerned about the UN than anyone other than the Czechs (Czechs are pretty unlikely to have your No5 part). If you'd like, I can check with my local guy - I'd bet he's got one (or 30) hidden away somewhere, but he's not likely to have the pins- unless you're very lucky. Drop me a PM.