Well... I have great news! After being told NO, NO, NO for a few days, I can now confirm the following and my 77072424 lifted truck is going back to the dealer for the TSB spacer:
Currently, there is only the 77072424 kit!
The 77072424AA does not exist.
Currently, the 77072424AB can not be ordered and the dealer's system refers them to order the 77072424 kit.
I think there is an extreme lack of understanding of this kit and TSB by dealers. They just see the "AA" on the TSB and state there is nothing wrong with the 77072424 kit. Everyone just wants to say no so they don't have to deal with it (personal opinion). If you are dealing with a similar situation, I would highly recommend you call the dealer's part manager. Tell them to call Mopar accessories to confirm the "AA" kit doesn't exist and that the TSB write-up referring to the "AA" is a misprint. The TSB should read, "if you don't have the 77072424AB kit, you need the spacer, Period.
My dealer is ordering the spacers and will schedule this warranty service once the parts arrive. Costs are covered by FCA warranty because the dealer installed the 77072424 kit.
I hope this helps others with the same problem.