Hi Guys, I want to add this address:
ebay[at]industrytools.de it is for Guido in Germany very friendly and effiecient service and he can source most G parts and even Unimog parts if you have the part numbers.
You can also find him on www.ebay.de search for industrytools as the seller.
I ordered from these guys last week Monday and my package arrived today (i.e. 7days). The minimum cost to ship is euro110 for 20kg. Duties came to just over 1k on 6.5k worth of stuff. Not bad since one of the items I ordered was going to cost 6.5k alone.
You get a selection of parts and seem to be German makes e.g. Febi, Lemfoerder, Elring etc.
I am in the process of rebuilding my OM603 and have priced a lot of the engine components from MBSA and local suppliers. I managed to track down a company who supplies Kolbenschmidt engine parts. I recommend you try them if you cannot find what you are looking for at Alert or Masterparts. They generally deal in quality made parts.
The company's name is QEC (Quality Engine Components) 012 357 7800. I dealt with Aadil Mohamed who was very helpful and accommodating.