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What piece? I don't see any decklid trim on the page you linked.
On the right side under the ducktail wing ....
10-11 Trunk Filler Panel
Part # 4394
Price $99.00
This trunk filler installs between the tail lights of the 2010-11 Mustangs . Trunk filler gives the rear of your car a cleaner look by eliminating the concave body lines of the factory trunk lid
I noticed the filler piece too......I still like the look of the CDC better though....I think....I don't know for sure .....i'd have to see it on a car without that whole kit on it ....