Possible to add backup sensors?
 

I'm thinking about trading in my 1LT and getting a 1SS or 2SS, but some of the ones that I'm looking at are 2010 models before they added the backup sensors. Does anyone know if it's possible to add these sensors? I'm assuming I'll have to buy a new bumper cover, I just want to know what I'm going to get into before I decide on what to do.

Thanks!