I personally would not fit an aftermarket sunroof.
At the BMW factory, the cars that get sunroof, get an extra support piece of metal - and the hole in the roof can make the body structure weak. An aftermarket place would not be able to do this.
Aftermarket sunroof's leak, rattle, squeeek. Be sure you know what you're getting yourself into. Besides: are you sure you want someone cutting through your roof with an angle grinder?
I wouldn't
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