Join Date: Aug 2009
Location: Gaithersburg, MD
The trim pieces are heat welded in at about 8-10 pillar points. To remove the old one you can just pry it and break the welds, or better, drill out the welds at the ends of the pillars and then pop it off.
To replace, you can either glue the new one back on (heat glue gun or silicone caulk should work). Or do as I did and drill small holes in the ends of each of the pillars on the trim piece (turns out the longer pillars are actually hollow, so you don't need to drill far) and then use small sheet metal (AKA self-tapping) screws from behind the larger panel to attach it.
Owner of "Campbelle", a Brazen 2008 GXP ... with mods piling up...