Thanks for reaching out, Clay!
To get replacement mounting hardware for the Blue OX # BX1692 base plate kit on your 2008 Chevy HHR you'll need to reach out to Blue Ox at this link - https://www.blueox.com/about-us/contact-us/
When I reached out to them about getting a replacement hardware kit added to our site they said it's only available through them.
We did have the chance to install this on a 2008 HHR though so I'm attaching that installation video to this page if you'd like to reference... view full answer...
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