I am looking for replacement retainer clips for the side and top trim band that goes op the sides by the rear quarter windows and across the top. There is a part code "Z4990" stamped on the bottom of one of the existing clips. The clips are approximately 1-3/8" wide by 1". Does anyone know where these can be found? Also, I am trying to figure out how the vinyl top side trim attaches to the base plate attached to the roof.