WARNING: This page is about a different car, the 2006 Lexus IS 350 and 2006 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Exploded View Of Rear Combination Light Components (1 Of 4)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig 2: Exploded View Of Rear Combination Light Components (2 Of 4)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig 3: Exploded View Of Rear Combination Light Components (3 Of 4)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig 4: Exploded View Of Rear Combination Light Components (4 Of 4)