I have a 05 yukon xl denali. It has the bose system. I tried to remove the rear pilar panels and they have little speakers in them. For the life of me, i cant figure out how to remove them or get them loose enough to remove the panels to allow the headliner to drop down in rear. It almost like they were molded into the panels. Are there any pictorials or videos that assist in this? Evey video i find is of a non bose or non denali and focuses on door speakers. The goal is to drop the back of the rear headliner down to access the roof. . I can rebuild my front end but this has me stumped.