The snaps work well. One at the top so the strap doesn't fall in, and one at the bottom the material stretches (very little) but mine holds the window up tight. I put it down on the return road every pass, 300 passes. You can see the left side is down, the right side is up. The shiny spot on the right between the door handle and vent is the down snap.
Doug
Do you have a full pic of your car? Just trying to see how that color looks over the whole car,not sure on the color on my 64 and not saying I would do your color,love it, but just getting ideas of shades because some just don't work on a Savoy. Hope that came out right. LOL