Can?t install spare tire carrier. What?s this in the way?

[scorp508]

Edit: Solved! The car used to have vacuum actuated muffler valves but those were pinned open long ago.
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My 94 has no spare tire carrier and no spare tire delete brace. I?m adding a spare tire carrier back for a long drive coming up. The left bracket installed fine, but there?s a vacuum ball and what looks like a check valve using the right side bolt holes. Were these relocated from somewhere else? I noticed one side of the ball?s mount has no bolt, so I assume this isn?t where it should be.

Thanks in advance.