Thanks for some good ideas. I did run a piece of foam beneath the new seat cover, but the worn springs on the driver's side edge of the seat continue to be a problem. Who/ Me?; did your guy fill all of the springs, or just the worn ones? It seems like I could slide some smaller springs right inside the older ones, or something equally simple. I'll try to stuff the worn ones first and see if that keeps my butt from sliding off towards the door...

Thanks for the help!