Just returned from my award winning chrome shop,1/24, is this flawless re-chrome of this rare Hella license plate lamp for the passenger side which has the Hella K2810 clear plastic lens on both sides and illuminates the license plate and the country plate option which was on the right.
You are buying only one passenger side lamp.

Used on the W186 300, W188 300S and the early 190SL.

These are the rare early version where the screw to change the light bulb is at the bottom end with the drain hole. It is not correct for the W108 or W109 because those screws are on top and the drain hole obviously on the bottom.

In the last picture I have the base and back plate with the oval hole in it and the clear plastic lens which was used for trunks that didn’t have a separate trunk light. This piece is not included in the sale but is listed separately.