If you are referring to the rubber part, I have linked below. It melts in heat due to people using sun block lotion or some other chemical that makes it deteriorate with the heat from the sun. You may have to clean it off with goo gone or something before putting the new one on. You may also need a 90 degree screw driver adapter to help with getting the screws off. Other wise, pretty easy fix.
Amazon.com: IE Works Rear Hatch Button w/ Screws Liftgate Switch Latch Cover Compatible with Toyota Prius Lexus 4runner Scion Camry Trunk Door Release w/Screws Repair Fix Kit Replacement: Automotive
