Darryl,
I believe there may be some posts already on this, but here's a quick summary of how I did it:
1. Use a new and OE MB seal!
2. Takes 2 people to do this job
3. Place the rubber seal around the windshield
4. Use a new aluminum trim surround (if possible) and one that IS NOT Bent! Note: even if order a new one, it may take several reorders to get one that is not bent!
5. While one person holds the windshield (on the floor or bench) gradually install the trim surround into the rubber seal. I had to use silicon spray to assist with this... There is a grove in the rubber seal that holds the rear of the trim surround in place. This is sort of a "lock" grove.
6. Once both sides of the trim surround are installed, lift the windshield onto the car and set the lower end of the windshield in place with the upper end tilted outwards.
7. Install the drivers side wood dash bow (if not already in place)
8. While one person holds the windshield in its outward & tilted position, the second person installs the "pull rope" around the inner lip of the rubber seal. Use the pull rope to assist with pulling the rubber inner lip into the cabin area
9. While gradually pulling the rubber seal into the cabin area, gradually start to let the windshield fall backwards and into position. Gravity will help it to fall into place. The hard part is to MAKE SURE that the aluminum trim surround stays "locked" in its rubber channel. As the windshield falls into place, it pinches the rubber seal together and locks the aluminum trim surround. This is why it is almost impossible to remove the trim without removing the windshield (unless it was not installed correctly to begin with, or the rubber seal is old...)
10. As you allow the windshield to fall into place (gravity assisted), it will sort of "pop" into place....
11. Basically at this point its in and your finished. Lastly, install the small center trim piece on the top portion of the trim surround.
12. In addition to the rubber seal, I also installed some add'l sealer under the rubber seal as added water tight protection. Some say this is not needed... your call..
Good Luck!
Bob