Hi, This part does not fit the 2013 Lexus GS300 or GS450h Base 6 Cyl 3.5L. I could not make a recommendation since the complete vehicle information was not provided. For accuracy of fitment - On the Homepage, please enter (complete) your vehicle’s year, make, model, sub-model, and engine size. Type the part's name in the search box. 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.

Hi Abraham. This is an OE Replacement. As long as you use it for the intended vehicle, it will fit perfectly.