Any tips for rear window rattle without seat removal? Options

[carcus]

I get some rear window rattle, the glass on the back wall under the seat back pad. I was thinking of putting something behind the seat back pad near the lower part of the window to quiet it down. When I put the seats in I put silicone under the lower part of the rear window and I put a new seal on the outer part near the rear trunk where it meets the rear window. I still have a little glass on metal sound. Granted, our roads suck here but looking for options. Not taking the rear seat or back pad out again.