Originally Posted by mdyaman
not sure if it's drilling holes into your bumper is the right thing to do, but then again I'm not a mechanic or know anything about body work.
I would think you would need to buy the correct rear bumper with the holes in them already, sensors, and the attaching pieces.
Bumpers already have the area embossed where the PDC sensors go (atleast for sure the front one does). I think that's a reasonable price. It's a serious pain to wire the sensors through the firewall and into the trunk. Also keep in mind that the factory wiring diagram has an error in it, so make sure to let the shop know about that.
I had mine drilled for the front PDC and it looks equal or better than factory. I did the wiring/module install and programming myself and brought it to them just for the bumper part of the retrofit.