Need the one on the driver side. It must have popped out while driving.

 

goodluck finding these from someone i tried cause when i bought my car it didnt have any best bet is to get em from gm heres the part #'s i have em memorized lol

89025744 Driver Side http://www.gmpartsdepartment.com/par...&siteid=214533

Hope i could help bump for u

 

^ Fricken awesome. Thanks for the link!