I have done 3 of these windows. One in a 107 and the front and rear in a 115. A couple of points that may help.

If you are going to get a shop to install the window, and I would recommend it since they have experience handling glass, find out from the local MB dealer who installs their glass. Chances are good that the dealer has a glass shop do it. Ask the shop to go through the steps that they will use to install the glass. There is a sequence to follow and if they don't follow it they can break the glass. Since the glass is not supplied by their shop they don't care if they break it. They will tell you before they start that they will NOT guarentee the installation since the glass is customer supplied.

The steps are; install the rubber seal around the glass. Install the aluminum trim into the groove on the outside face of the seal. Install the entire unit into the car using the rope method described above. If you don't put the trim in first you can not get it in the seal once the window and seal have been installed in the car.

If you are going to install this yourself I highly suggest that you get atleast 2 helpers. When you fit the unit into the car you will nees one person inside to pulol the cord around, 2 people to set the glass onto the frame, and one of those people to push down on the botton of the window to seat it along the botton edge of the body opening.

Since you have already removed the window I assume that you took out the trim. If so be careful with it. It is very soft and you can easily kink it. If the trim is bent you can straighten it with a rubber mallet and by gentally bending it. The easiest thing is try not to bend it in the first place.

I didn't use any adhesive or grease but that doesn't mean that they are not useful. Mine haven't leaked yet but there is still tomorrow.

Since you have the window out use the opportunity to reglue your headliner in the back.

As I remember the B pillar liner on my 107 (the 115 doesn't have them) slides forward to release. They each have two clips that fit into slots in the body.

rs899 mentioned about the window trim 'lying flat'. This trim is curved to match the curve of the window an is not supposed to be flat. You can recurve it if it is bent but don't over work it since it will work harden on you.

Good luck