How much trouble is it to change out the seat track assembly on the 2001 model? The seat is equipped with side air bag so we don't care to change out the whole driver's seat. Can we buy a track assembly from the junkyard with the power seat motor and bolt onto our present seat without a big deal??? I can see the seat track is bolted to the floor with four bolts but how is the upholstered seat attached to the track assembly?