not to resurrect and dead thread, but here is the info needed that wasn't clear for those who want to get rid or replace their rack.
The clip retainers are NOT installed under the roof racks that come from the factory, so if you want to use the stock filler clips, you need to order them or find another way to keep them in. The only thing under the rack is a thin film gasket. The bolts can be reused.
>Upper retainer - either side: #19184014 - MSRP: $7.95 / GMPD: $4.78
>Lower retainer - either side: #19184016 - MSRP: $15.44 / GMPD: $9.29
The cover clips are thin plastic, unlike the rubber roof rail. And you will have an outline of the larger rack boot on your paint, but clay compound will clean it up.
Removing the rack is fairly easy.
The outer shell is attached by 2 clips pointing down on the front and rear of the rack base, and one sliding clip in the center top(see diagram, although it is likely just as confusing)
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The entire rack is held on by two M12 bolts on each side; they have plenty of locktite on them so they might be tight to break loose.
The bolts go through roof and there is an interior loose bracket underneath - carriage bolts or similar are not welded to the roof. If you take off the rack and are not using the oem replacement clips, you have to reinstall the bolts or the frame clip underneath the roof will rattle as the bolts no longer hold it in place.
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I decided to just use some black silicone, a large dab on each bolt head that contacts the cover, and a little thin strip on the leading edge. Nothing is holding in the rest of the rubber roof rails, they are just pushed into the groove and loose to allow water to drain, so this may not work in extreme situations, like if you blast it with a pressure washer.
FWIW: The clips retainers and plastic covers seem like a silly solution, if the default model has no roof rack. A lot of diff parts for a std config. Another chunk of rubber with inserts to fit in the bolts wholes would look a whole lot better.