Just fyi you can make this fit your prophecy.
you just need to get the Z2 "spine" (the subframe that holds motor and crap) that integrates the feed tube, and the Z2 floorplate. With the standard prophecy magno clutch taking up space, you are going to hold probably the same amount of balls as a rotor which isn't much. To cheap out, you could cut up your own floorplate.
"I'll see it when I believe it"