I noticed the other day that the lense on the right light is missing, the light still works fine. Is there a part number for this piece? I know it's not a big deal but I would still like to put a replacement on it. Anyone know the part number?

 

GM doesnt list a part # for the lens, only the whole mirror...

 

I have a listing of part number 12517104, which is for a repair kit for the light assembly which is supposed to include the lens pieces.

I'd call your local dealer with this part number and ask them to list exactly what is included with this kit -or ask them if they can tell you the part number for the lenses, so you can get confirmation that this part number is what you want.