You are looking at a good used Right Rear ( Passenger side ) 2 piece plastic fender flare set as pictured.This pair is from a 4Runner without running boards! It may work on running boards but I'm not sure!
From a 1998 Toyota 4Runner SR5. This is a used Right (Passenger) REAR Fender Flare. It is a 1-piece-type flare, EXACTLY the part. (runs around the rear wheel well on the Passenger's Side). AMP Industries, part number 00547-35970-PR.