Very disappointed with aftermarket FEBI, MEYLE, and URO parts. Made in China, re-packaged in Germany in a German box and they are junk. I started using original Mercedes Parts through the classic Center in California, utilizing my MB Club of America 15% discount and the original parts are not that more expensive than the aftermarket.
Well worth the extra money, ask for Tom Hanson, the parts manager there. Guide rod mount kits are night and day difference between original and aftermarket parts.

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John
1986 300sdl
1985 380se