I have the mxl-v67b. The shockmount is a mxl-57. Although I'm not exactly sure but a m1006 may work as well. I am sure about the mxl-57 though. ...............Joe Recorder
I own both mic's and the Studio Projects B1 uses the Studio Projects LQ-21 shockmount and the Marshall MXLV67G uses the Marshall MXL57 shockmount.
But whatever you do, don't buy Studio Projects LQ-21 shouckmounts from Hollywood California because they'll rip you off. They charged me $102.93 for two LQ-21 (B-serises) shockmonts that should of cost $19.99 each.