Per Lexus website, it appears a new "Sport Design Package" is now available, complete with "Scarlett Tail Lamps, Sport rear valance/front fascia, & 18" Gun Metal 5 Spoke Alloys".
GX Luxury Packages have standard Captain's Chairs w/Optional Sport Pack
GX Premium allow a-la-carte captains chairs, captain's chairs & Sport Pack, or standard Premium w/ bench seat.
I do not believe base models allow for captain's chairs or sport pack.