The UPPAbaby Aria V2 attaches straight to the UPPAbaby Cruz V3; there is nothing extra to buy. With the carrier on, you are pushing about 32.5 lb (26.5 lb stroller, 6 lb carrier). 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 Cruz V3; UPPAbaby Mesa (original), UPPAbaby Mesa Max, UPPAbaby Mesa V2 and 1 more need no adapter at all.
Summary from the makers' published data.
How to set up the UPPAbaby Aria V2 on the UPPAbaby Cruz V3
What you need
The UPPAbaby Cruz V3
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.”