if it don't bolt right up you should be able to shave off the side bolt supports on that radio buy a DD dash kit and just slide into that and bolt it right up. Not 100% sure would wait for more thoughts from people with more wisdom but i think it would work.
before you order it make sure it comes with the wire harness from the HHR. It doesn't show it in the pic but you would want that so you could splice it in to the TB
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