Don't really need to go to expense if your springs are still intact. Just steam the foam out and slip a piece of carpet in there. You might even put some Dacron on top of the carpet(use spray adhesive) to poof it up even more if you want. Mine's like 1000% better now, it used to pour me out into the street when I opened the door. Only thing is my seat bottom up/down lever pull thingamabobber's jammed.

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)