You are purchasing a (1) Genuine Mercedes-Benz Lift Jack Pad Cap that goes to one of the 4 jack points under the side skirts.  This will prevent damage to the car chassis when performing a service or lifting the vehicle with a floor jack.  Often these are missing or damaged on these older vehicles.

Part # 2019970086

Fits many models listed: 190E 300E E320 400E E420 300TE E300 300D 300TD 230E 300CE E500 500E W124 W201

Fun fact: Mercedes still uses this jack pad on their AMG GT cars with the same 201 part number!

You can press these in or install them with the vehicle on the ground using a quality floor jack after positioning them into their respective holes.