I have a series 1, and comes up as Prestige for most insurers. Sometimes, However, it is included as an option to select manually. Mine has nav, Mark levinson, sunroof, sports pedals, starfish wheels.
re2011 model, this may help:
https://www.drive.com.au/car-review/lexus-adds-x-package-to-is-250-and-rx-range-in-australia-74494.html