I just did the front and back windows on my 115/300d (and the rear on my 450slc a while back) and here is what I learned. As stated be careful taking out the aluminum trim that goes in the rubber seal. Take it out before you take out the window. I used a Wunderbar pry bar but I think any wide, flat, and thin pry bar will work. Just ease the bar under the trim with out trying tp pry it up too much. Otherwise you will get a curve in the trim. The trim is very soft. You can bend it back into shape but if you don't deform it in the first place you won't have to go through this exercise. Now that I think about it I guess you could cut the rubber seal away from the inside edge of the trim. This might make the trim come out easier.

Next cut the rubber seal away. Cut off the section between the slot where the trim went and the center of the window. Then go inside and run a thin blade between the seal and the window to break the seal away from the glass. If you remove the rear seat it makes the removal and installation easier. Plus you can now clean the muck and money out from under the seat. If you have a rear window defroster you will have to remove the rear seat inorder to disconnect the wires.

Go outside and ease the blade under the glass to free it from the seal and lift the glass out. You can also do this by inserting a thin stainless wire through the seal. Wrap each end around a screwdriver or some such hand hold and pull the wire around. Lift out the window. Better to use two people to lift the glass out.

Store the glass on its edge. Be VERY VERY careful when handling the glass. I tried to clean around the edge of mine and cracked the front window.

If you get an installer to replace your glass ask him (most installers are hims) how he intends to do it. This is a trick question because if the tells you that he will install the glass into the seal, the window/seal combination into the car and THEN install the trim you need to find another installer. The trick is that the glass must go into the seal first, THEN the trim into its place, and THEN this entire unit into the car. You can not install the trim once the glass is in the car. Sak your local MB dealer who they get to install the glass. Chances are that they contract out this part.

I took my glasses out myself but had an installer come to the house and install them. He charged $75 each for the front and rear. It was well worth the money.

Good luck.