AFAIK the US-version 123 headlight switch is not wired for rear fog lights. I added extra contacts and wired the "new" positions for a second tail lamp in each position. Addition of an aftermarket 3rd brake light then gave me three brake lamps and four tail lamps.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970