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Currently, there are two mouthpieces listed on EBay as Perantucci M4 & M7 Old Style. Does anyone know how, or if, these numbers relate to the current PT system? I've seen the conversion chart that translates the most recent re-numbering of PT mouthpieces, and I couldn't find any "M" numbers on it. Just curious, as the seller (of course) gives no dimensions.

So nobody knows anything about these?...

M4 or M7 is stamped right into the mouthpiece. They look similar to an older B.Tilz that is also listed currently on EBay.

Great! Thanks.