I'm no expert but have taken a few of the vents apart test fitting that darn division channel seal. Didn't see where there was much if any adjustment for the triangular glass.

Here's one thing I do know about the seals. The Metro ones (in the purple bag) are the good vent window seals. Soft and compliant. The Precision ones (in the green bag) are VERY HARD rubber. I had customers return them cause they couldn't get them installed. I don't sell them.