Saw on the G8 board today someones Third brake light LED's were out. Although rebuilding / resoldeing is an option if you want to get a new one they are a bit pricey:
The one for Caprices and G8's is 92155454 - ABout $225
But here is the secret. All you really need is the LED circuit board not the entire assembly. But it is not listed in the parts catalog along with the drawing of the Third brake light.
The one circuit board part number is 92198828 - About $55
Here is a pic of it:
http://www.australianonlinecarparts.com ... ht-led-lam" onclick="window.open(this.href);return false;
And a typical US web catalog:
Have to have a real good counter guy to track down just the LED's