Thanks to Charlie Mullendore of Antietam Classic Cycle for sending me this information via email. In Charlie's on words:
Ducati coils (Paso?) can be substituted for the originals. Bolt on without modification, will require different wire terminals. The coils I used had permanently attached plug wires, so I used NGK plug wire splicers to lengthen them.
Ducati coils fit to Moto Guzzi small block models.