I need some advice on re-installing the rocker panel covers on a '04 E320. I got them off pretty easily. Removed the plastic push pins and the bolt. Got them all cleaned up and am having trouble with the white plastic clips along the bottom of the door openings when I re-install. They stayed on the car when I took the covers off. I do not see how the rocker covers hook back onto them. Do I have to take the clips out and put them on the rocker panel covers first? They don't seem to want to budge from the door sills. Any experience with this would be appreciated.