Re: seat for 1990 Waverunner III
From your local upholsterer...
If you buy the foam, make sure you buy a direct replacement bun from the factory. I haven't priced it yet, but I'm willing to bet it's at least $100.
If you take it to an upholstery shop to recover it, it's another $100-$125.
The seat may look the same, but the mounting may be different. Best bet is to call the dealership and have them cross reference years for you. No charge.