The headliner board has come detached in the left rear corner. From what I can see there are 2 clips or something similar back there holding it up. I took it to an interior shop and was quoted $125 to take the headliner board down and reattach it the right way. Does anyone know what exactly is used to secure the headliner board in a 2005 Deville? If so, where can I get replacement clips and is it a tough job to do? I dont want to pull it down too far, for risk of cracking the board. The interior shop (should I decide to go that route) said that either I can get the clips or he can, but I can probably get them cheaper. Where would I look for these?