^^ is the direction I would take. Maybe there's nothing "wrong", just too much unforgiving mounting of stuff and everything is transmitted into the pass. compartment.
All cars have vibrations in them, it's all how they are controlled really. If you look at a modern car they do all kinds of things, specific rubber compounds in the mounts, mass dampers hung off of all kinds of things and so on.
How bad is the vibration? Does the mirror just buzz or can you feel it in the seat, steering, floor boards, shifter, etc.?
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