I went to Home Depot and bought foam weatherstripping without any adhesive. 1.5" x 1.5" x 42" strip. I cut it into shorter pieces and used a knife (the dull ones you use at your plate to cut stuff like veggies or spread butter) to wedge it between the glass and the shelf on either side of the 3rd brake light housing. Its dark grey and I got it down far enough that you can't see it from the outside. I can see it in my rear view mirror though but its no big deal. The rattle is gone. Cost $1.50.
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