Add some style to your Sierra with one of Putco's Premier Designer Grilles.  The Shadow Grille Inserts are a simple clamp-on grille insert made of  Billet Aluminum polished to a mirror finish.  This Billet Aluminum Shadow grille insert simply installs over your existing Sierra grille with Putco's hidden mounting system. 

• Putco's Premier Designer Grille
• Unique Diamond Pattern styling tailored to the Sierra
• NO DRILLING, CUTTING, or removal of any grille components required
• Mirror Finish Billet Aluminum
• Simply installs over the existing Sierra grille
• CLAMP-ON Hidden mounting system - no exposed bolt heads
• Limited lifetime manufacturer warranty

So there is no drilling or cutting on your part!  The Shadow design  is unique and tailored to the GMC Sierra.