This is the best place on the net to get anything you need in metric! I get all my supplies from them, plus they know Mercedes and Unimogs as they are owners as well!

https://www.belmetric.com/

Tell them Von sent you, and you might get a discount!

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Von
Fairport, NY
1973 Unimog 416 Doka
1980 Unimog 416 Doka
1981 Unimog 416 Doka
1984 Euro 280CE w/diesel conversion
1985 300TD Estate wagon
(I really need to stop buying these things!)
http://vonsmog.com