Not sure about your model; but my 85 300D has adjustment screws for how the sunroof will set; higher and lower in corners....
my advice get a good referel to a sunroof repair shop. In my area there's 1 who knows these and he's an upholstery interior guy.

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'87 924S
'81 280SEL

Sold ->

81 300SD -
93 300E w/ 3.2
85 300D-
79 300SD
82 300CD
83 300CD - CA
87 190E 5 spd
87 Porsche 924S

"..I'll take a simple "C" to "G" and feel brand new about it..."