A customer contacted us earlier seeking a replacement remote for his original Crimestopper alarm system 2-button keyfob that has FCC ID CHXP19695 and one gray button and one yellow button. As it happens, there are two parts that meet this description and they are not interchangeable. There also other 2-button Crimestopper remotes with the same FCC ID and different button colors. The remotes are not all interchangeable. So, the only way to specify the correct part is by the model of the Crimestopper alarm system installed on the vehicle.
This is one more example of situation where one has to be careful when buying a replacement car remote. Using the FCC ID and visual characteristics alone is not a fool-proof way to identify the correct replacement keyfob.