My assumption is that you are looking for what is referred to as "Glass Setting Tape", this looks like friction tape but comes in different thickness to fill the gap between the glass and the metal frame. This should be part of the glass shops job when installing the glass in a windshield frame. If you are doing the job yourself just inquire at your local windshield supply or you might try to purchase some in bulk from Restoration Specialties, Windber , PA