I recently bought a Bach 17C, which is recommended for those who play in the high range continuously. I find it very comfortable and very easy to blow. Just about any well-stocked music store should have this. I also find the 15C bach trumpet mouthpiece
The 22 series Bachs are likely to be hard to find, and I’ve been told it can take up to 6 months for Bach to produce the less-frequently used sizes.