Just pick up a $5 plug and drill the apporpriate size hole thru into foam with a "paddle" drill bit(read previous posts for details). Let drain till water stops coming out. Seal new plug in with Rule Eleastomeric only and attach any screws. The new stainless plugs coming on the newest Bay 190's are nice but a simple brass screw type is fine and cheap.
Over time, water will find it's place into the inner hull foam area. At worst, you might get a few gallons of water to drip out of there. Really no big deal. These boats don't sink and even when they are completely filled with water, the motor sits high and dry and functional. Use your search or just go back in the 190 section about how to seal your deck properly and add the ball/cage scuppers. I pull all three bilge/inner hull plugs when I take the boat out of the water. I have a 2002 Bay 190 also so feel free to e-mail me if you have any questions or need more details.
Enjoy, the Bay 190 is a very sea worthy boat but you can tweek it and make it even better. MolarBoater