So, I have a quick question. I have a Schreiber G Clarinet (Turkish style)plays in E flat. Can somebody tell me, does it matter which mouthpiece I use on it? Should I not but a Bb mouthpiece? Or can one use a Bb mouthpiece on this? Do I have to find a G mouthpiece which seems impossible Any help would be appreciated.

Bflat mouthpiece should work
Where did you find it?