Spare parts holder to fit a spare tire well:
@ALB is close. It's made by Rubbermaid. Here's a very old post about it:
"I was just walking through WallMart and saw this thing just sitting there. It is a Rubbermaid, 16 inch, "Tag-Along" condiment tray, and is made for taking chips and salsa to a picnic. (Note: Remember that I have 16" rims on my car, not 15")
It has a round central tub for the salsa with a separate lid, three molded bins for chips (or spare parts in my case) and then a large lid that goes over everything. It's also water-tight (as I found out yesterday).
The whole thing fits into the well of a 16" space saver spare like it was made for it, and all you have to do is drill or punch a hole through it so the spare hold-down peg fits up through and then use the spare's trim cover hold-down spinner to secure it."
I just checked on both Walmart and Target and couldn't find one, so Rubbermaid may have discontinued it.
Here's what it looks like:
