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I have new foam..in the basement not installed yet, cant wait. Tell you this, it cant be worse than the tired old seat you are sitting on now. My back is killing me after a short drive, the seats in my old C3 were sooo much superior.
I put aftermarket foam in mine when I got new seat covers. It is thicker and heavier duty and is quite a bit more firm and does sit a bit higher than it did but not uncomfortably so. Of course, the old foam was tired and wore out so I can't really say how it compares to new OEM foam. Some folks don't like the feel of the thicker stuff but it's fine for me. My son occasionally drives my car and is heavier than my 6'1" 240 pounds and he found it a bit uncomfortable.
I put in after market as well and it does sit a bit higher then what I had been sitting on. The wire had pretty much worn right threw the foam. I put down a old yoga mat cut to fit between the new foam and the wire seat bottom.
From: It's true money can't buy happiness, but it is more comfortable crying in a Corvette than on a bicyc
St. Jude Donor '13
I put an after market "firm" foam in and hated it. My head was an inch from the top. It was uncomfortable on long trips. Felt funny on short trip. I'd adjust the seat constantly trying to find a good spot.
Bought an after market oem style foam from ecklers and couldn't be happier.
I also agree you need something between the foam and springs. Burlap, jute, piece of blanket, whatever you got. It helps keep the springs from slicing into the foam