So it seems that there was a 3rd Generation Tatakon for Taiko no Tatsujin released by Namco back in 2004.
As you can see, it started being bundled with the Tobikkiri! Anime Special game, and includes a new stand that can hold your drumsticks when not in use.
The main reason I bring this is up is because apparently, they changed the way they designed the inside of the controller, too.
As you can see, the pegs that hold down the rubber face has changed dramatically, along with the way the sensor is held along the rim. The rubber pegs actually go THROUGH a hole in the plastic pegs, which poses a serious obstacle in removing the rubber face from the tatakon. Since I don't have this controller at all, I can't figure out how to actually go about removing the rubber face without actually cutting a hole on the side of the plastic pegs to remove them that way. If anyone has the model, numbered NPC-108, please post here and see if you can find a way to remove the rubber face. I'll go and see if I can get this bundle, or any of the later game versions with a tatakon bundled together, so I can go about doing this myself. I ask this since someone else needs help fixing the controller, who is having trouble with the corner sensors not being sensitive enough. Thanks, fellow Donder!