Passenger side? this is a common failure on your model. My w124 just had the same thing happen about a month ago. Subframe rail rusted out behind it and it popped off. Took it to the body shop and they cut out all the bad metal, welded in new, and then welded in a new perch and sealed the whole thing with por15. If the repair is done properly then it should be as good as factory.

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Streetside: 1987 Mercedes 300E Petrol Blue/Green
2014 Ford Mustang Grabber Blue
1999 Ford Ranger Green

Dockside: 1968 Eltro 17
1985 Silverton 34C