I've had the (ahem) "pleasure" of doing flex disks on several cars now and have purchased both the Febi and the Lemforder flex disks. These go at either end of the drive shaft.

Lemforders are made in Germany. Look very good.

The problem I had with Febi flex disks is that they were warped in construction. I put one on the transmission and then hooked up the shorter front section of driveshaft. It wobbled nearly an inch at the loose end! Had to go back to the original MB flex disk as it wasn't too bad and held the driveshaft straight.

Buy the Lemforder flex disks. They're not warped, and are Made in Germany.

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles