Last month I installed a grid charger, and needed to remove the rear seat, top and bottom. I noticed that there is a gap along the top of the seatback and the rear window tray. I assumed this is for heat dissipation from the electronics behind it, as the seatback does fit in the slots which hold it in place. Non-hybrid models don't have this wider gap. Can someone look at theirs and confirm this wider gap is normal? I'd never noticed it before until I put the seat back in. Thanks!