Drive for Riverossi N scale SW1500 Calf Units

[LensCapOn]

ConCor offered it with a Kato Drive. Many many other SW units would fit the shell.

 

http://www.spookshow.net/loco/rivsw1500.html

[caldreamer]

Does anyone know of ANY drive that fit the old Riverossi N scale SW1500 calf units that has the low profile wheels that will run on code 55 track?

   Thanks In advance

           Ira