I received my gasket and the instructions are not exactly what they showed on YT which made it seem that the seal was made by the rubber.
The instructions they send says to use 3M glazing compound (96-8509-96) on the area just outside the pinch weld. and then they say to use 3M auto clear sealer (96-8551-96) between the rubber and the glass on the outside after it is in.
I guess they have it a o'reilly's. I'll update later.