THATS THE STUFF .You need glass setting tape... Go to Moparnations pinned GTX resto thread and find the index table on page 117 and find "Glass".
Here's me doing a vent window...
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As dadsbee mentioned above...As others have said you need glass setting tape. There is a issue though no one has addressed, what size. i have the same channel that I purchased the tape for and determined that I needed 1/32 glass setting tape for that piece. Yours should be the same. What you do to confirm is measure the inside channel with a slide calipers, then the thickness of the glass. Subtract the glass thickness from the channel width then devide by 2 in order to determine the proper tape thickness.
Then I have one more favor to ask. Does anybody have 2 to 3 feet of scrap setting tape they are willing to sell me cheap? It seems most of the tape that I see for sale is 10 and 20 foot long rolls.