David,
Make sure that you are installing them on their respective , right side of the coach, they are directional, and I put a couple on the wrong way, and wondered why they didn't fitproperly, maybe yours are different , but I can' imagine them making more than one type, and your window frames are most certainly the same as mine.
I didn't keep my old ones because they were all missing.
I was amazed at what a difference those things make for wind noise, I have never really worried about them before , but once I installed them, what I thought was a leaking windshield seal, was about 90% gone.