The transmission from a diesel 124 (1990-94? "300D 2.5" OM602 5-cylinder turbodiesel) should fit your car; I'm not sure about the gasoline-engined 124s. Perhaps someone in the gasser forum will know.

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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