My 2007 9-7x has he rear bumper corner crushed in and I would like to remove the bumper to try to fix. I removed all visible screws (in wheel well and under the lift gate) but there seems to be something in the center still holding it on. I tried removing that rear grey rubber piece which seems to pop out from all molded clips except one on each end so I do not want to force it. What am I missing? Any help would be appreciated. Thanks!