This is looking at the outside of the gasket as it is attached to the outside of the cake pan, you can see the rivet and gasket. I pushed the gasket up against the lip in the pan and measured the distance that I need to drill the holes in the pan so the gasket would fit tight against the lip. Place the rivets every 4 to 6 inches.
Another picture looking from the outside of the pan and how the gasket hides the rivet. I painted mine black after I had everything installed to hide the white rivet and washer.