I'm looking at doing my own with aftermarket seat covers and foam from SOR or the like. My question is,what do you do with the wiring (springs) in the seat bottom? It looks like it may have been molded into the original foam. I have one outside wire sticking well outside of the foam,on the driver's bottom. I've checked,it's not broke...the foam is toast! So when you get the formed bottom cushion from SOR,how does it join with the springs? My seats are the original high-back w/ headrest from a '78 FJ40.