In my quest for many of the missing parts on my 914-6 conversion project, I have used RetroAutomotive Products out of New Hamshire with great success. They mostly sell through Ebay, but can be contacted directly as well.
I've been working with Roger most of the time.
Without exception, every part I've ordered from them is the right part and in great shape as well.
Some examples of what I've found through them include:
914-6 oil tank filler neck clamp
fresh air distribution box that was in incredible shape
little brush sealing slots that the headlight arms run through
horn ring for my 71 steering wheel
and on and on
When no one else had these parts, RetroAutomotive did.
Just my experience of course.
Wonder if anyone else on this site has used these people as well?
I have a 2.4MFI motor going into my conversion.
I'm sure I'll be contacting them for some of these parts as well.