I dont see why not; but I recall them fitting pretty dang tight as it is. I did not use any glue anywhere on my vent windows.
I think the vent window "tips" had a rivet on each one. I know I used them....if they came in the little zip-lock bags with the tips....then I used 'em.
Jeez, I re-did all my windows two winters ago, and already I'm forgeting some of the finer points.