The UPPAbaby Aria V2 attaches straight to the UPPAbaby Vista (2015–2019); there is nothing extra to buy. The seat itself is rated up to 30 lb and up to 30 in, per UPPAbaby.
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32 other infant seats fit the UPPAbaby Vista (2015–2019); UPPAbaby Mesa (original), UPPAbaby Mesa Max, UPPAbaby Mesa V2 and 1 more need no adapter at all.
The answer is not the same on every Vista: it differs on the Vista (before 2015), as the table below shows.
Summary from the makers' published data.
How to set up the UPPAbaby Aria V2 on the UPPAbaby Vista (2015–2019)
What you need
The UPPAbaby Vista (2015–2019)
The UPPAbaby Aria V2 carrier (its car base stays in the car)
The UPPAbaby carrier attaches straight to the stroller frame; the manuals below show exactly where.
Before every walk
Check that the carrier is locked on both sides the way your manual describes. How we check our answers
Last check: give the carrier handle a gentle tug. A seat that is fully latched does not lift off.
“Compatible with Vista V3, Vista V2, Vista 2015+, Cruz V3, Cruz V2, Cruz. Compatible with Ridge, Minu and Minu Duo strollers with use of adapters specific to each model.”