Yep backglass is urethaned in using a 17mm universal molding. Windshields are the same,glued in V-butt with molding.
Removed frames on door glass',
Don't even get me started on british cars, Especially old MG's.
I could only imagine the look on someones face if I pulled a bottle of KY out of my van. HA!
I use good old fashion glass cleaner for all gasket installs.
And that is my professional non legal opinion.