Oh…did you see a need to install a new, more adjustable UCA? TIAJust the front - this spacer kit https://www.peaksuspension.com/product/2024-lexusgx550-1-25-lift-kit/
I've had all of my work on our two 4Runners, our Tundra TRD Pro, the Siverado and now the GX done by the accessories / customization guys at Durango Motor Company (the local Toyota dealer). They are an authorized dealer and installer for every brand of off-road suspension or accesory I've ever looked into. See DGO Autogear | Auto & Truck Accessories In The Four Corners