If the B164 has the Furuno 10-pin plug it can connect directly. If it has another plug you may be able to get an adapter cable from a dealer. The B164 is a diplexed transducer so a matching box is not needed.
If you just purchased it new it should have the proper 10-pin cable end on it.
The MB-1100 is designed primarily for non-diplexed Furuno made transducers. Airmar makes a box designed specifically for their transducers.