I did an r&r on a 98 vette today and could not get the bag to stay on the bg. There is a rubber gasket that goes along the frame of the glass. I shoved a bulldozer into the top/front gasket to hold the bag in place, then proceeded to pull the gasket out a little on the sides and stuff the bag in and put the gasket back all along the glass. The bag stayed in place, and I got the job done.