Google it. Try the basics first, something like "Cadillac CTS throttle body spacer". I did and found nothing. Also searched the forums... no luck except everyone being on the same page of them not being useful.
Do that before going Chihuahua on a forum designed to help you. We completely understand your point about don't blow the subject up, just get you information. The "drama" comes from the fact that it is a fact they do no good and some are really adamant about it being known and joke heavily about it. Just move on.
The thread has been dead for a reason. No throttle body spacers for these cars as the intake manifold, runners, plenum, etc. are already about the best they can get. Not many performance parts at all for our cars, which, as you probably found by now, are slim to none for the non-V CTS.