Cadillac 2007 Escalade EXT Owner's Manual page 184

To replace the drain grate do the following:
1. Line up the clips on the vehicle with the slots
in the grate.
2. When you are sure that the clips are aligned
with the slots, push the grate down firmly.
The grate should clip into place. Do not force the
grate if it will not clip into place, realign the
clips with the holes and try again.
184
Side Rail Channels
The side rail channels are located on top of both
sides of the cargo area. You may want to flush
them out with clean water if you notice any debris
collecting inside of them.
When loading cargo into the cargo area, be
careful not to damage the rails.