I ought to e-mail them or something and remind them. The Pal Jr. and Amiga 1000 expansion boxes like it adhered to the original Zorro 1 standard. Zorro 2 didn't come out until that part of the Amiga 2000 design had been finalized.
Both Z-1 and Z-2 are the same as far as bus specifications are concerned; as they found out you can plug in half sized Z-2 cards into a Z-1 slot and they will work. But Z-1 had a completely different form factor. The expansion cards were square.
I wish I still had my old Amiga magazines from the time, where this was all clearly explained and I remember it well! I'm sure someone else out there remembers this. I mean, there was a reason why Zorro 2 was called "2" and not "1", haha!