Originally Posted by AwesomeM3

63-21-7-227-791 rear tail light
63-21-7-227-792 rear tail light
63-21-7-227-793 rear light, trunk
63-21-7-227-794 rear light, trunk

There aren't any plug-n-play harnesses to buy. I had the dealer do the install and coding all at once, but I hear the install is pretty easy. Just tell the dealer to recode for the LCi tail lights; they should know what to do.