Hi Chris, This is the for firewall side or bank 1 of 2006-2008 Lexus RX400h and 2006-2010 Toyota Highlander Hybrid 6 Cyl 3.3L with Federal emission type. To check the fitment please use our Vehicle Selector — which can be found towards the top of the homepage as well as all categories, search results, and product pages — can help verify if a part will fit your specific application. To enter your application, simply select your vehicle’s year, make, model, sub-model, and engine type and click “Go.” Once your application is selected, you’ll see a “Guaranteed to Fit” badge if the part will fit, and we recommend that you also double-check Your Vehicle Fit Details as well as the Vehicle Fitment Information table on the product page.