I think I can help you with the generator condenser (NOS and the holder is part of the consensor) and I'm sure in all the diffs we Aussies seem to accumulate (or maybe that should read i accumulate because i like lugging heavy useless things like that about!!!) I can find a plug!- is it the one in the cover plate or the one in the diff housing itself?
I am away at present and won't be home to check probably for another week or more on the plug, but if you can let me know which one you need and if there is anything specific about it for the diff housing your (and my!!!) fine march 42 MB's should have, I'll check it out and get back to you?
Please send me a pm with your email and remind me as things are pretty chaotic at the moment so forgetting is highly likely, not because I want to, but I just won't member! I can't help with the other bits sorry.
42 Script MB: 131175 (parts searching)
42 Script GPW S/N: 11730. Fin: April 13th, 2006.
44 GPW S/N: 225290. ACM 2 body.
Aust trailers: GMH 3- #211, FMC 4- #1523 (FMC 3A #374 sold)
42 Ford F15A CMP (Blitz).http://www.vintageengines.net/