Found this on the HOC forum...
I am not a dealer by I know a man who is and is based in Kettering Northants. He has just purchased three heaps of CB400Fours that have been stood for a while and painted in military style with wrong seats etc. Rat bikes to say the least. However with these came a lot of parts which are original or close replicas. There is at least one good seat, some chrome mudguards and exhaust systems. Three engines two being on the frames and a seperate frame. There are numerous bits so for those of you who are 400Four fans and need parts perhaps worth a call.
Contact Colin at Ape Accessories 01536 516078 and see what he has to offer.