UPPAbaby Vista Upper AdaptersOur Vista allows for multiple second seat configurations. The Upper Adapters for your Vista creates more space between your primary and secondary seats. Quick, no tools attachment Color coded dot indicators to ensure proper installment Stroller folds with the adapters on Compatible with all Vista* models. For all Bassinet models, Vista Toddler Seat, Mesa Infant Car Seats, and Aria Infant Car Seat *Not compatible with pre 2015+ Vista models