Richard : Just an "educated" (?) guess. I believe, based on the TSB that John originally Posted in a previous Reply (which now appears as only a part of it, so I have re-Posted it here), the original "fix" for the grills rattling was to do as the Factory did, by adding the small O-rings to the Posts. However, in so doing, many studs were broken, and the whole grill had to be replaced, at the Dealers' cost. To avoid this, Article 1217 in TSB was added. In Article 1217, as you can see, the "new fix" was to add a 3M adhesive to the posts. It is my supposition, that a Dealer or Owner, not wanting to use an adhesive which may prove hard to remove "down the road", decided to use tape instead of adhesive to eliminate, or at least reduce, the rattle.
Just a thought.
Bob