Try this one.

On my 74 W114 coupe the hardened plastic ball socket on the firewall end of the accelerator linkage went to pieces from age. This allowed the linkage to just flop around in the mounting hole. It caused some pretty strange behavior when you pressed on the pedal and also didn't want to go back to idle.

Couldn't find anything in my collection of oddball spare parts but I did manage to find an old shock absorber bushing. One of the ones from the top part of the shock. A little carving to fit it into the hole, a $0.45 plastic bushing from the hardware store and it's back in business.

Now I need to look up the part number and order one from the dealer.