UppaBaby Lower Adapter In Rumbleseat V2+, Bassinet, Mesa/AriaOur Vista allows for multiple second seat configurations. The Lower Adapters for the Vista allows you to attach a Bassinet or the Mesa car seat to the Vista as the secondary seat. Quick, no tools attachment Color coded dot indicators to ensure proper installment Stroller folds with the adapters on Color coded dots to indicate left and right Compatability: Vista V2 & Vista 2015+ Lower Adapters for all Mesa Models and Bassinet