The Size 8 uses M8 or M10 studs for B+ (battery positive) and B- (battery negative). The manual stresses:
The following are the technical specifications and drawings for the Sevcon Gen4 Size 8 controller: sevcon gen4 size 8 manual
Setting up a Size 8 controller requires strict adherence to safety protocols due to the lethal voltages involved. Sevcon Gen4 AC Motor Controllers Overview | PDF - Scribd The Size 8 uses M8 or M10 studs