Need Help Duster Quarter Glass Install

I am installing the quarter glass in the 70 Duster.The glass is new with a new seal. In cleaning the frame assembly ,I noticed it had some sealer on the top part of the frame and some weather stripping on the lower part of the frame.I went to mock up the assembly on the car .When the window is sitting in the quarter panel there is a gap of about 3/8 inch.The questions is what type of weather stripping is needed on the frame?Do you need to put some type of weather stripping on the quarter frame as well?How thick does it need to be. It has been a long time since I took the car apart.Any help would be much appreciated.
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