Use Micro-Trains 1133. That one is almost universal for older B-manns. These cars are an older design. If you plan to run around really sharp curves, you can use 1134, which is a longer shank version of 1133. Bachpersonn sells dummy knuckle couplers that you can use, as well. Unimates of varying shank lengths are also out there. Unimates are dummy couplers, as well.
If you are going to use the MTs, buy the coupler tweezers. They are indispensable and inexpensive.
If you are going to use the MTs, buy the coupler tweezers. They are indispensable and inexpensive.