It's on the left inner fender, next to the ABS pump and behind and to the left of the windshield washer reservoir. AFAIK, it's the "standard" location for the preglow relay in every Benz I've ever seen.

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"Buster" in the '95

Our all-biodiesel family
1995 E300D (W124) 201,000 miles My car
1996 E300D (W210) 289,000 miles Wife's car

"Politicians are the same all over the world;
we build bridges where there aren't any rivers."
-- Nikita S. Khrushchev