I am ordering a Conn 48B Vocabell from an out of state music store today. I plan on using this horn for big band and solo performances of the National Anthem. I am not sure that it would blend well in the symphonic setting. I understand that the older Conns have a slightly different sized mouthpiece receiver. I would like to find a vintage Conn mouthpiece that both fits my lips and the horn's mouthpiece receiver properly. Having one that fits the horn visually would be nice too. What Vintage Conn Mouthpiece would be closest to a Bach 3C?