Hi,
Though they are a long way from you I can recommend heritage Motor Works in the UK.
www.heritagemotorworks.co.uk They are traditional skilled metal workers who have worked on many WWII military vehicles and specialise in repro parts for the James ML. I have had a repro headlamp blackout mask from them which was indistinguishable from an original. As they will have original patterns they might be an option for the lightweight parts if you cannot find any originals.