I am hoping you guys can help me out on this. So far I have struck out with BAV Auto and my local dealer.
My 1987 325ic is missing one tool from the kit. And so far every E30 I have looked at is missing the same one

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In the trunk tool kit tray, on the left bottom corner is a spot for an item that is about two inches tall. It kind of looks like a socket but it is about twice as wide at the bottom than at the top.

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So if anyone knows what goes there please tell me. My car is in a BMWCCA clean car contest this Sunday, May 22. It would be nice not to lose points for that open slot.
I am coming to the experts, y'all. Help!