Chevy HHR Stereo Install

Can anyone tell me where to find a wiring harness that will work with a 2006 Chevy HHR, or failing that, find a wiring diagram?
I purchased a harness from a local installer, but the connector is not correct. The current factory stereo has two small connectors, one with 16-pins the other with 14-pins. Presumably this is a GM/Chev connector, and not specific to the HHR.
Any insight would be greatly appreciated.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.