I have some SR5 seats from a 4Runner that I am selling. They are in one piece but the fabric needs to cleaned or covered. When I got them they were "dirty" and I just used some seat covers to hide it. They are very comfortable and have adjustments for the lumbar and bolster. Also the thigh section of the seat can be raised or lowered depending on comfort.
Right now I have some 97 leather 4Runner seats in the front and back, very comfy except for the summer months when you start to sweat. The leather does make it easier to clean the truck, two Golden Retrievers, all the hair and dirt just wipes off or blows off with the top down.
LMK if you are interested in the seats, they are gray.