I have to remove my headrests to install seat covers. The front and middle back headrests all removed easily but the rear outer two will slide up and down and can be set at several heights but cannot be released past the highest setting. The dealer tells me they should pull right out. I notice that the height notches on the two rear outer headrests are slightly different from the front two. Taking it to the nearest dealer on Tuesday, an hour and a half away. Anyone else have this problem?