So I found a used snow blower online that I am very interested in. It is PTO driven, has the hydraulic hoses, but the number I cannot seem to find online. the mount is quick mount BX2751. Anyone know what the "B" is for. All my paperwork shows the "A" "C" and "D" but not "B". Id hate to buy this and not be able to use it.. It came off of a BX23 so think it is proper.