Has anyone R&R'ed the plastic panel between the rear of the headliner and the hatch? I put a tubular barrier behind the rear seats, for the dog. I want to remove the outboard child restraint brackets in the ceiling and bolt in a pair of solid brackets to secure the barrier better. But I can't back the bolts out without removing the plastic piece, and it's not obvious to me how to do this. I've broken my share of trim fasteners over the years - it's better to ask first. THANKS!