I can vouch for MBS. They replaced my soft top a few years ago. If you only want the windows replaced they will need to remove the rear part of the top and send it out for the windows to be sewn in.

I had a good quote from an upholstery shop in Lilburn that claims they perform this service for several shops in the area. I'm sorry, I don't recall the name of the shop but it is the upholstery shop on Hwy 29 in the Auto Service Plaza located just south of the Lilburn Post Office. I did not let them replace my windows because I decided to replace the entire top. I will add that this upholstery shop later did a good job replacing the headliner in my SL hard top.

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02 S500
92 500SL
92 400E (Sold)
87 300E (Sold)
83 300D Turbo (Sold)
75 300D (Sold)
74 240D (Sold after 20 years)