Hi tom
Welcome to the club. Sounds like you have spent many an hour behind the wheel of a unimog! How do you find running them doing agricultural work?
In regards to finding your unimog, might be worth emailing a couple of the northern dealers. They might know who and where it's is if it comes into the work shops or even if the owner buys parts from them. You'll be suprised who knows what and who knows who in the unimog world.
Good luck
Casto