My wife bought a 2020 Seltow and the right back seat rattle was there. I tried the remedies on this group, but none worked. I decide to take out the back seat and found the seat hinge doe the 60/40 split, is metal on metal. I used a old rubber pipe and cut two washers. Put it in and put all back. That did the trick. I hope it helps someone. Drive safe and enjoy.