Sounds to me like somebody took the riser from A Cougar III Compound, and married it up with a set of recurve limbs.
If that is the case, it wil lbe impossible to find official parts. Your best bet is to improvise like aromakr suggested.
Once you get 'er done, you will have a unique, one of a kind trad bow.
Also, talk to the "nice people at Martin" and ask them ifthe Cougar III compound hadthose ball bearings. If so, see if you can get somefrom them.