review this thread first: https://mbworld.org/forums/c-class-w205/799953-diy-panoramic-sunroof-clip-repair-place.html

Here are the parts required: https://www.amazon.com/Sunroof-Repair-Parts-Mercedes-Benz-Pieces/dp/B08DCC9LV2/ (unofficial, of course, as MB does not provide replacement parts)