Hi Nev,
I have an 84 1/2 Targa Top 20th Anniv. FB and I'll be at the meeting tonight. We also have David with a, 85 Coupe and Dennis with an 86 Convertible. The best value for small parts seems to be Fox Mustang Resto. email:parts@foxmustangresto.com who are in the US. For big or heavy items check with Graham Folwell of the Club, who's son has or had an 83 SVO.
I have only had to get non metric wheels to get onto non metric tyres, a new distributor and also the main ignition module unit; and had no problems. Also a fair bit of stuff appears on e-bay.
Cheers. Geoff Grace