My experience with seat foam is you have to form it yourself. I've had better luck purchasing large pieces of seat foam, (ebay, amazon, home depot special order) and using it to replace the bad sections of the original seat. I cut out the bad parts, then use a spray glue like gorilla glue and piece it together. Don't forget to cover the foam with a layer of cotton. You can get the cotton from a fabric store or even Walmart in the fabric section. I use a very sharp flexible hand saw, or electric turkey carver to cut the foam. Good luck!