Ok lets start this post by making sure that the above picture is NOT with an original aftermarket rubber seal. I got one from Dennis Carpenter and its been mounted and under pressure for a few months and STILL it didn´t came close to letting the vent align with the cab. It was almost 1/4 of an inch above the cab, in the front of the vent. So I decided to take it into my own hands and modify the seal itself.
Above is the seal seen from above. I took a carpet knife and only extended the knife blade enough to penetrate one of the rubber walls, as the seal is hollow. Then I cut it on the inner most ridges, all the way around. Opening up the seal as seen below.
