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From the Cervenys I have measured, most Euro shank mouthpieces should fit fairly well, but the taper is slightly different. I think the "Large shank" in your link will be too big.

The original Tilz and PT mouthpieces had the correct taper for Cerveny receivers, but they changed at some point.

I can make any of my shanks with what I think is the correct Cerveny taper.