<https://roofrack.com.au/product/holden-colorado-7-trailblazier-black-2-bar-rhino-rack/#product>
<http://schema.org/description>
"Racks connect to existing threads on inside/back of rails on roof rails. There are 3 positions on the rails. No drilling to install. The Vortex RCL roof rack system is specifically moulded to fit to the factory mounting points. Can fit to any of the 3 positions double threads on inside face of the factory fitted rails."
<https://roofrack.com.au/product/holden-colorado-7-trailblazier-black-2-bar-rhino-rack/>