Hey Joe, Sorry for hijacking your thread, but when I saw your post of the whole kit I planned to add my .02.
This the Hew Home Attachment box I picked up.
[ATTACH=CONFIG]444374[/ATTACH]
The bits are VERY different from yours. They are mostly "unknown" to me.
If you look just to the right of the open lid you will see the odd little foot that all of the binders attach with.
[ATTACH=CONFIG]444375[/ATTACH]