I want to correct my earlier error. All my Cyclones seem to be early models. The Cyclone w/ short cage and CycloneGT have identical upper bodies but of course different cages. The short cage is unmarked, the long cage reads 'CycloneGT". My confusion was that the claw adapters are different, the CycloneGT being attached to a longer adapter than the other Cyclone. Apparently the adapters were not all the same. The Cyclone GT with the black upper and lower bodies does indeed have a different upper body; it is longer so derailleur reaches down farther and is thicker so it requires a longer mounting bolt than the others. The cage is marked simply "GT". Hope this helps.