We got the SL500 seats set up on brackets in the middle of the car. The blocks of wood are just to hold the seat up on the outside until we get the outside rails of the chassis installed. These seats have a ton of adjustment, front to back, up and down, recline, etc. I think Greg can drive this car with just a phone book now.
Check out the heavy duty aluminum construction of the seat frame. These seats are heavy but really bitchin.