BigShot ABY Passive

[Jayz]

I'd like to make a simple passive "Y" splitter to feed two amps even if the amplifiers have large "ground" voltage differences. The "BigShot ABY" appears to do that but I can't find the model of the transformer used in the circuit and I don't need the A-B selection ability.

Attached is the block diagram for the BigShot. Can anyone suggest an appropriate make/model transformer?

PS - also attached is the spec sheet for the OEM transformer.