This isn't my Shasta, but this is the window that we are having issues with. The black rubber gasket is shredded and needs to be replaced. Whatever i ordered from VTS was not right according to the window place that replaced the back window for us. So what is the correct stuff?
Not sure which one you used but VTS does carry the correct one, its avaiable in black or grey... I used grey. It fits just as good as the original seal, which doesn't really seal all that well. I might shoot a small bead of clear silicone in the joint before applying the seal.