Aucky,
The US NATO plug (as used in Mr Robinson's finest) is the U-174/U, which I believe is the same as the TP-101 (and TP-102 and TP-120). A convenient line-up of Nexus products can be found here:
Pambry Electronics Audio Electronics Specialist and I believe there is a list of retail distributors in there somewhere too.
If you need the Bose ANR panel-mount plugs, these are 6-pin keyed jobbies, made by Redel and available from Lemo UK. The part numbers I used last were PAG.M0.6NL.AC52NZ (plug), GMA.1B.040.DN (strain relief gland), PLG.M0.6GL.LG (socket).
FWIW, the GA plugs (as used in most fixed wings) are a standard 1/4" mono for the audio (stereo in some cases) and a 0.206" diameter version for the mic (p/n PJ-068) - Switchcraft make a socket that works for this (p/n M641/5-1) which can be had from Farnell (among other places).
Standard audio minijacks can be had from just about anywhere - wherever you get the other bits from should have them. If you're really struggling to find the requisite plugs, give HSL (
Headset Services Limited - Contact Details ) a ring; they will charge you rather more than getting the bits from Farnell, RS, etc, but they're really helpful and they can send you the right part from a vague description. Ask to speak to an engineer if you go this route.