Make sure that the company knows how to install MB windshields. Ask them how they do it step by step. Two things are important to watch. One is that they remove the aluminum trim WITHOUT bending it, and secondly, that they install the trim into the seal AFTER they install the window in the seal and BEFORE they put the unit into the car. Don't just take their word that they can do it. Ask them to run through the proceedure step by step. The trim cannot be installed once the window and seal are installed. Be very careful with the trim. It is very soft aluminum. If bent too many times it will tend to work harden and perhaps break. The trim does not need to be replaced. Check the price with MB and you will see why you want to take care of it.

Take the window out at home. Then you can check for and repair any rust you find. You can also reglue the head liner where it wraps around the window opening. Remove the rear view mirror simply by pulling back on it. It is held in by 2 spring pins and should just pop out.