EPC for your model-year shows part number 003 997 63 82 "Hose, sliding roof water drain, order by the meter." It shows in the drawing as being at the rear of the sunroof. Going by the drawing (which I don't trust) there are also front drains but I can't find a part reference. If there is a front drain you should easily find it.

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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