upholstery question

[WANT '71 280SEL]

I was disassembling the rear seat back out of the junkyard 500SEL and have some questions. I originally was wanting to eliminate the horsehair pads all together but how could that be done with those wires that run through it? The seat cover has little plastic clips that clip onto the wire holding it down in the middle of the cover. Am I suppose to somehow run a similar wire through the new padding? If I kept the horsehair pads I thought I would put some additional new padding on top of it between the cover and the horsehair, but once again, those wires would be the hold up. Could someone chime in who has had a rear seat apart?

Thanks
David