Flapper with float (Rockville)

This toilet flapper was in a tank that emptied and was unused for a while, and so it kind of dried out, shrank and hardened a bit, and then it didn't quite seal the hole at the bottom of the tank anymore, so I replaced it with a new one. Maybe it would fit a slightly smaller tank opening? Otherwise, it is intact. The diameter on the top is just shy of 2.5 inches. It's a lovely shade of dark teal. And the float still ... floats.