I have checked 2006 gmc sierra led fog lights that they have 2 different types.

Most of 2006 gmc sierra led fog lights using 9145, but one of 2006 gmc sierra led fog lights using 880.

So you need to confirm 2006 gmc sierra led fog lights correctly.

If you want to use 2006 gmc sierra led fog lights, 9145 is the same as 9005 because they are same base.

So 9005 can replace 2006 gmc sierra led fog lights perfectly.

I will show you 2006 gmc sierra led fog lights as below.

Hope you come to talk with us 2006 gmc sierra led fog lights right now.