Ok, so first step been completed.
Front side windows replaced. If anyone is interested, part numbers are:
5E3845022 (right side)
5E3845021 (left side)
Nothing else needs replacement, seals are the same. In Poland i have paid 865 PLN per windows, so roughly 180€ in dealership. Tried to find used windows, but only found them in Sweden. It made no sense, as price (with shipping) was just 20€ lower, than new ones.
Replacement is rather easy, once door card is removed.
1. Remove 2 plastic caps marked in green.
2. Lower your window, so that you can see holes/openings in the glass.
3. Use screwdriver or something similar to push plastic windows latches, that you can see through hole in the glass (sorry, haven taken pictures of this part). Push gently, but rather deep. At the same time try to move the glass up. Once it's release, you can remove it.
4. Release straps holding wiring (yellow marks). Do not cut them, as those are not regular straps you can replace with anything!
5. Take off plug marked in red. Disconnect all plugs.
6. Remove 2 torx screws in point marked in red.
7. Rotate green "screws" by 90 degrees counter-clockwise.
Now you can remove whole window lift part, gaining access to inside of the door if you wish to use the mats there. If not, you can skip points from 4 to 7.
Assemble everything in reverse order.
That's it.
One note - after this, you will need a diagnostic interface to clear airbag error. Round part with yellow plug is impact sensor.
I have used the mats in the doors, on speaker frame and on the midrange driver mounting place on the door card. Mat is 3mm thick.
Also used accoustic foam (self-adhesive) on the door cards.
Now door and window feels much more sturdy. Sounds completely different when you knock on it/hit it. Also give very satisfying closing sound.
Inside you can hear less noise from passing cars, but it's still present. I was surprised, that it has also reduced a bit tyre noise and suspension sounds. In general improvement is quite good, at least up to 100-120 kph. At 140 kph difference seems to be little bit lower, as tyre noise is dominating. I guess will need to also do wheel arches, and maybe part of the floor.
Also one can still hear windo noise from the windscreen. Not replacing it yet
Please remember, that i did all at once, so i cannot really say what would be the effect on replacing windows only, without dampening the doors.
Dampening the doors has improved audio significantly. It still lacks lower bass, but at least now bass much better controlled, more punchy. Sounds much better in general. Now i have to do a rear door
Edit:
One more photo - inside of the door. Haven't used the mats on reinforcement, as i don't think it resonates that much, and didn't want to add more weight to the door. They are heavy already now