The Highlander struts for front and rear (08-13) will fit the rx. If you use 10-13 front struts you will have to use 10-13 front springs as well. You can find more info on here for the 1st gen highlander, which is mechanically the same as the 07-09 rx. https://www.toyotanation.com/threads/1st-gen-bolt-on-upgrade-list-other-modifications.1695939/