1991 350SD om603. Installing new tecalan fuel lines. Now I need to know where to get the banjo bolt sealing rings. My Mercedes dealer of choice say the are NLA. Is there an alternative.

Thanks,
Kris

Pelicanparts has sealing rings listed by size both aluminum and copper
Take your pick
Just need measurements

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1983 300CD Turbodiesel

Any big box auto parts store has a metric assortment in copper or aluminum.

I have several copper washer assortments from Harbor Freight, grabbed when on-sale. I throw spare aluminum washers in there too. I never worry about re-using them. If scuffed, I just sand the surface, though some here claim you must heat-treat them to restore. Mine don't leak.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

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

When I rebuilt the engine on my 650 Triumph, I remember that you were supposed to heat the copper washers on the stove until they got red hot before installing them again. Never really knew why. Was it called annealing?

Yes, when metal is cold worked it gets hard, heating it up to a critical temperature softens it.