This transformer comes in many designs this is the most popular, but this will work in place of the original aslong as it has the correct connector fitments for the motor and handset, there are 3 types in this design with different connectors,
This product is for the JM61: 8-pin and 5-pin
Similar transformer with different connectors also available - listed below
JM64: telephone-socket type and scotch 2 pin plugs
JM65: 2-pin(1flat,1round) and 5-pin