You could contact Seydel harmonica repairman Greg Jones at 1623customharmonicas.com and ask if the Saxony rounded mouthpiece would fit. When I had a Saxony, I replaced the trapezoid mouthpiece with the rounded one. I preferred the rounded mouthpiece. I’m not saying it’s better, just that I preferred it. But if I were you, I’d play on the trapezoid for a while. It might work just fine for you once you get used to it. If you don’t like it, you can replace it later. Besides, the Saxony mouthpiece costs around $70, if I remember correctly. So it’s a little pricey.