[MojoBari]

I realy don't know if you can say to a refacer (it would be good if one of the many whom contribute to this forum would answer here) this is a mouthpiece which works on a 3,5 rico reed , open it up and make it feel good with a 2,5 reed (or any other size for that matter! )

Sure you can. But there is some risk involved in the results. I would recommend you get WW&BW to send you a Selmer D, E, and F on trial to see if any of them seem right. Problem is, Selmer tip openings vary some. I have a C* on sop that measures as a D. So if they do not have these three sizes, pick any 3 in the same ballpark. Even 3 Es.