Snell type B :help w/thread size and bind.post id

I have no clue but you might just try e-mailing them via their web site

http://www.snellacoustics.com/

Type B, which is relatively rare, or the more common B Minor? I have the B Minor. Binding posts on back are like this:

R R
B B

As for thread size, give Snell a call -- they're very friendly and helpful. (978) 538-6262.

Best regards,
Paul