The seat foam is tired in my front and rear (both benches) seats. I'd like to get seat foam that is preformed and firm. I noticed that Danchuk sells it for $250 per seat but they say the front foam only fits seat frame assemblies, #10064, #10065 and #14703. Where do I find the seat number? Also, anybody have any suggestions on where's best to buy it, and any comments on your purchase and how satisfied you are?