BOB Duallie Infant Car Seat Adapter - Duallie/Britax (S02984600) | BobParts.com
Amazon.com : Baby Trend Sit N Stand Easy Fold Travel Double Baby Stroller and 2 Single Infant Car Seats Travel System with Safety Harnesses and Cover, Stormy : Baby
Britax Infant Car Seat Adapter for Contours Element | Stroller Accessory