I usually get part numbers and check prices on marineengine.com. You can shop around once you know correct part. SEI, Sierra, Quicksilver, and Mercury Marine all provide reliable parts.
I gotta ask though, are you sure that your exhaust manifolds are in good shape? Consider removing your spark plugs and rotating engine a few turns to ensure you didn't get any water in the cylinders. Flywheels are expensive and I'd hate to see you ding your new one.
2006 Bayliner BR205
A1 Gen 2 1.47
5.0 carb engine