Chaps, I'm pretty sure I have seen that and it is an adapter to enable those with the "newer" (post project drive) fuse boxes, to use the arm rest/ cubby hole auxiliary socket kit. This is because the fuse box is totally different on the project drive cars ... as I learned to my expense!
I'll dig out the documentation which I think I kept and will compare part numbers.
HTH
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Christopher
in banana veritas 
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