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This question may have been answered, im taking all the extra steps to run an aggressive, squared setup on the 3isAWD as we know there's no manufacturers providing 3is AWD upper control arms (under $1500).
Here's a link to a member with a RWD 3IS with 2IS upper control arms: https://www.clublexus.com/forums/bui...l#post10454692
I realize you are looking for AWD, but what the link confirms is that the 2IS UCA will fit the 3IS. The mounting points on the chassis for the AWD and RWD for the UCA are the same, so it stands to reason that a 2IS AWD UCA will fit a 3IS AWD.