I just did something a little different. I had seats from a base coupe that had Katzkin leather covers. These covers are designed with some piping that runs down the midline of the seat. I took one of those memory foam lumbar pillows, cut it down, cut it in half, and insterted each half on either side of the midline piping. the seat still looks pretty normal but feels much better. i need to take some pictures and will try to post soon.