Yes they are available. I had them on a previous 123 car I owned. I finally removed them because when I used them for fog, everyone thought I had my high beams on and continuosly flashed at me. Pissed everyone off.
I put in the amber/yellow ones and NEVER did anyone react that way again.
The amber/yellow are preferred because the reflected light off of moisture in the air (fog) is less objectionable.
BTW, I often will drive with my fog lamps on, whether it is foggy or not. I like making my car appear distinctive in traffic, seems to help with some drivers who try to pull out in front of my car during the limited day light hours of winter.
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)