I really struggled installing these seals, they are a real barsteward to fit and there are a few tricks that are not immediately obvious. So, I have decided to share "my" method, it may differ from your method, but it works, so please if you've done it a different way, that's fine, so long as it works for you.
Firstly tools I used:
Plastic trim tool set (Ebay - less than $2)
Hole punch tool
By far the most difficult and most important part of this installation, is getting the 'kink' part of the frame installed correctly. If you don't do this, it will fail, when you install the interior 'U' trim, as the pressure will pull it back out of the frame and you'll have to start over !! Not funny, trust me, I know...... it really pisses you off !!
So, the basic method is as follows:
I won't go into removing the old glass in detail, but if you haven't yet done this, beware of the retaining pin, that holds it in behind the B pillar rubber seal, if you go pulling and then pull harder because it wont budge, it will eventually shatter.........I know.......I just know OK. There is just one pin and it is towards the top of the B pillar.
If you have fitted the metal B pillar glass channel, remove it. You will see why later. Take the seal and first, fit the lower horizontal portion into the chrome trim, this is generally a good fit and shouldn't need trimming, just ensure it is a nice fit and you have pushed it into the recess of the chrome trim. DON'T TRIM THE SEAL AT ALL YET AT THE B PILLAR END.
I found the next bit crucial if you want the seal to remain in place. You need to take the razor blade and trim the seal, on the inside edge, where it sits in the kink, otherwise, when you bend it to fit, the inside edge splays out and makes it virtually impossible to fit into the frame.
Just mark the area where it kinks and shave off the edge. Don't worry, it won't affect the seal, or be noticeable once installed.
You are now ready to start installing the seal into the frame. Don't do this in isolation, push the interior 'U' trim into place on the inside, at the same time, working a few inches at a time, this will ensure the seal fits correctly and means you find out right away, if something isn't right, rather than wait till after you thought you'd finished !!! Use your plastic trim tool, to start pushing the seal into the frame, starting at the very bottom. Work a couple of inches and you'll almost be up to the kink area, then stop and go about 3 inches above the kink and start working back down towards it, pushing the rubber into the kink at the same time. It is vital that you now ensure the interior 'U' trim, is fitted correctly and snugly and as it should be, use your nylon hammer to tap everything into place and don't move on, until you're happy that this area is fully fitted and won't pull out later.
I used this tool, it takes quite a bit of force to push the seal behind the frame.
You should now have something resembling this
So, now you're happy with this area, go ahead and work the rest of the seal into the frame work up towards the B pillar. Just work it slowly and remembering to also fit the interior trim as you go. Stop every 6 inches and give the seal and trim a few taps with your hammer, to settle it into position.
Once you get to the B pillar, you'll need to trim the seal. I just used my razor blade for this, it was easy. You need to judge where to cut for yourself, but for obvious reasons - don't go cutting I too short !!!!
Once you have the seal in place, pat yourself on the back, go and make a coffee and rest your hands, because they'll most likely be killing you from all that pressing in of the rubber !!!
The next bit, might differ from other people's methods, but trust me, it works and it makes life easier.
Basically, rather than fit the B pillar glass channel and rubber to the car and then fit the glass. Fit everything TO the glass, then the whole lot to the car in one hit.
So, take the metal channel and temporarily refit it to the frame, with a couple of screws, then fit the new rubber piece and centre it between the other seal, you'll notice the outer bit of rubber will need to be trimmed, do it later when the glass is fitted, so you know it's correct.
The reason to fit these now, is to mark for a new hole, for the glass retaining pin, as the holes in the new rubber are most likely not in the correct place !!! So, go ahead and mark where the pin would go through the rubber.
Then take your hole punch tool and punch a couple of new holes for your new split pin (not supplied).
Now fit everything to the glass, including the opening handle (if it was removed). The pin is inserted from the inside, as shown, but I don't think it would matter too much which way !!
Scuse the grubby fingers !!
Now carefully push the glass into position on the B pillar, paying attention to the rubber seal sitting correctly. Once inserted, whilst holding the glass, reattach the opening handle to the C pillar (thus ensuring the glass won't fall out). I did mine without a rear window, so it was simple, but if you have a rear window installed, you might need someone in the car to help out.
Now, on the inside of the car, pull back the B pillar rubber trim to reveal the metal channel and the holes to secure it, using the self tapping screws.
Refit the four screws and push the rubber seal back into position, then trim off the excess rubber on the outside.
Hey Presto.....You're done.... Congratulations !