Bought some sliders for a steal from a local guy, didn't think to ask about hardware until I drove 2 hrs to meet him... I'm dumb. They're currently mounted without the brackets but I'd like that extra little piece of mind. Willing to pay shipping (assuming it's reasonable) or pay for a custom fab job if anyone can give me a reasonable quote and can source the design one way or another. Hard to price since GM doesn't seem to make them independently, so I've got under $100 pulled out of my butt but am more than willing to have that discussion. Located in Colorado, zip 80229.