I like the slip on, take off design. I am doing something similar. Once the pad is installed I will be able to remove the vents surrounds, then the pad. The front of dash pad slides under a thin sheet metal runner riveted to the body, now held on by Clecos in the picture. The windshield will cover the runner. The vent surround then slides in and wedges the pad down and also holds the front of the surround down. Those are false screws nearest the windshield. With a short screwdriver I can unscrew the front of the vent surround, pull it out and then work the pad out.