You can't purchase just the mesh. Have to buy the whole grill. But you could get aftermarket mesh from ablaze grills. They have a few different styles which you can get in chrome or black. That might work best for ya.
2012 WK2 - Gloss Black Wheels - Tinted Tails - Tinted Windows - Windshield Tint Strip - Exhaust Tip - Altitude Rear Brow - Altitude Grill