I have a box with the same 5569992 and they are not marked on the box with Coralox Insulator. My AC Delco parts book is not handly at the moment but I believe that 5569992 is just their part number. You can read an old AC ad that explains with this marketing word means with regards to the insulator.
http://www.amazon.com/Coralox-Insula.../dp/B007V7SHAK