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I recently tried a Parker Mouthpiece and I loved it and I want to get one for myself. Which one do you guys think will work best with a Besson EEb? I normally use a Wick 3L or when wanting something smaller a JK 18.

Perantucci pt 65s or a Conn Helleberg 7b are my personal favorites..

Uh, why not get the one you used and loved?

Mouthpieces are really very personal. For my 981 clone I'm using the Wick 2XL and find it to be just about perfect. It is (to me) significantly better (for me) than the 2L. It took me quite a while and a lot of experimentation and comparison to get there. I'd suggest you really try the various alternatives over time if that's possible in order to avoid the "this is new; this is great" phenomenon that we can all be fooled by.