Amazon.com : Stroller Connectors for Babyzen YOYO2 YOYO+ Strollers,Turns Two Single Strollers into a Double Stroller : Baby
YOYO Connect Stroller Bassinet/6+ Bundle Black Frame - NINI and LOLI
Amazon.com : BABYZEN YOYO Connect, Black - Turn Your YOYO2 Stroller into a Double Stroller - Still Compact & Easy to Maneuver : Baby
Amazon.com : Twin Stroller Connector for Baby Universal Fits Umbrella Strollers Babyzen YOYO Yoya Etc.. Turns Two Single Strollers into a Double Stroller : Baby