Here are a couple of links for deciphering option codes:

http://www.amcon-luxled.com/mbcar/options.html

http://www.geocities.com/MotorCity/Speedway/5350/mbcodes.htm

The list on the radiator frame tag is not comprehensive. There might be a list among the papers with the owner's manual, tucked behind the back seat or some tag in the trunk.

The dealer or someone with a copy of the EPC can get you a list of codes as well. You'll need one of the websites above to get descriptions of the codes.

Sixto
95 S420
87 300SDL