Nissin 5/8 MC bolts right up.
Many Suzuki, yamaha, Kawasaki models have them.
look here:
Brake swap
OR do a google, and get a new one rather than a dodgy used unit.
you can re-use your lever and reservoir, so you can save a few bucks.
Or, you can go ballistic and get a Brembo or Magura Radial MC assembly (bling, bling)