Send it back. If only 1 is like that, it would seem clear there is a problem.
Actually, send them both back. KYB is junk, IMHO.
Bad results on a variety of cars. Short lifespan on all, and mixed handling results. Ok handling on some, awful on others.
I had to learn this the hard way. You do not.
Bilstein or Boge for the MB.
What else can you get from Tire Rack for the Chrysler?
1986 300E 5-Speed 240k mi.