Please Help! What are these HP-IL widgets?

[wscholine]

I have this trove of HP-71B stuff, including a lot of HP-IL equipment. I have these two objects that I think are part of the HP-IL developer's kit, and I'm trying to identify them. I hope someone here can help.

Clickable thumbs below:
Image 1:
Image 2:

I have the HP-IL internal module that fits into the HP-71B (HP 82401A), and an HP-IL/RS232C converter (HP 82164A), and an "HP-IL Interface Kit" (HP 82166C). I'm trying to figure out which one these bits go with.