If you want me to cut a piece for you, I will need some measurements:
1. The overall diameter (measured as if it was one whole circular piece.
2. The distance from the flat edge to the top of the curve.
3. The distance from the flat edge to the centre of the hole.
4. The diameter of the hole.
If you can measure these, I can cut you a couple of pieces. I have textured black vinyl with £m 467 adhesive laminated to the back. This is a very strong sheet adhesive - strong enough for car manufacturers to apply badges and trim with.