Yep, i "felt" around under the lining last night and do see what lip you are talking about. I am NOT about to try and "massage" this screen through the vent. I will remove the liner, cut it to fit exact and then temp secure it with some putty or whatever until get the liner back over it.
If i tried to do this with the liner on, i would no doubt mangle the liner and just get pissed in the process
When i get around to it, I will try to take photos of that portion to add here as well. Currently working on wrapping the stinger haus
hood vents so this one is a few down the project list!