Make strolling with your Contours Element® Single to Double Stroller and Cybex, Maxi-Cosi or Nuna infant car seat a breeze with the convenience of the quick click-in car seat adapter. With the purchase of two adapters, you can attach two car seats side by side. Designed to work with select Cybex, Maxi-Cosi or Nuna infant car seats. See the complete list below.