Replaced the intake gaskets on our 2003 Tahoe (a known problem with them) and while the knock sensors weren't causing any problems, while I had things sorted out I decided to replace them anyway and avoid one potential future problem that you will have to bump into the engine again. Delphi is the same as ACDelco, just a few dollars cheaper. They came individually in their own box marked 'Made in Mexico'. They looked just like the OEM units. I also replaced the wiring harness with a new Dorman wiring harness (I was impressed with the Dorman quality). I changed it a month ago and everything is fine. There are many Youtube videos that help with the exchange procedure. Heed the advice of many. Don't buy cheaper knock sensors. You will regret it and will have to do the job all over again. So get it right the first time and use Delphi or ACDelco.
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