Well, I got it

[Inspector]

Thanks John. I had no idea. Never heard it that way. So I guess it wasn't a stupid question after all. Again thanks.
Denny

[WhiteTruck]

Here I am thinking that his finger slipped off the shift key! This is a good way to help keep them straight. The early 2006 LLY is nothing like the 2004.5-2005 LLY, so is confusing to even think of it that way. I like John's idea.

[JohnC]

Just so there's no missunderstanding, "LBz" has no official meaning as far as GM is concerned. It started out as a sort of joke, but it conveys the difference better than "2006 LLY" does...