That means that you apparently had the answer to a very complex Alpine operating system configuration problem that even a veteran installer (GradeA) and us other Alpine dealers could not help him figure out without ultimately the assistance of Alpine Tech Support.

Kudos to you! That's what that means...

And GradeA, i bought a bunch of closeout Alpine stuff from A.A. off of a clearance list a few months back when they got dropped by Alpine. They had a quantity of 4 of those old expansion boxes left that I believe you are looking for. But when I called in yesterday and inquired about them, all the Alpine stuff was gone. If you want to verify a part number for me, I will see if they were indeed what you were looking for and I'll have them track the dealer who bought them. You may get lucky and be able to purchase them somewhere here locally from a dealer...