The HVAC control head was used in an Alfa Romeo, but it was made by Delphi. We just liked the compact nature of the knobs and controls. We had to reengineer the guts to make it work in an SSR. The only part really used was the housing and knob structure. I do not know what is in the HHR or SKY, but they look and act like SSR knobs on my HHR.