BF2034 Aubert Lutherie à Mirecourt double bass bridge 3/4 BF2144 Aubert Lutherie Luxe à Mirecourt double bass bridge 4/4 BB2034 Aubert Lutherie Made in France double bass bridge 3/4 BB2034T Aubert Lutherie Made in France double bass bridge 3/4 BB2044T Aubert Lutherie Made in France double bass bridge 4/4