I saw this on the on a CTS-V calendar that I have. They sell these for about $8 for two. I still had a scrap of my black vinyl and cut a couple circles of my own for about 2 cents. If you've got a black CTS it's an easy mod. With the remote entry you don't need access to the lock.
http://www.phantomss.com/smoothlock/index.shtml

http://www.phantomss.com/smoothlock/index.shtml