Wave or spring typ lock washers are used in all German vehicles ~ they're thinner and closed, no open overlapping edges .

Your local Hardware store will have them in the metric hardware drawers .

IIRC (possible) you're looking for a 10MM size .

I'd buy at least five each of 6, 8 and 10 MM sizes as they get lost occasionally and are easy to keep in your tool box or ashtray....

If you're a Junk Yard junkie like me, just look at the ground around VW's, Volvos, Mercedes and so on....

Keeping a stash of spare correct hardware is critical to trouble free motoring in older German vehicles .

__________________
-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better