I would think you'd have to weld some boss's on your exit nozzle and use a trim ring and exit nozzle for a kaw or yam..
I dont even know, is the pum nozzle alum on the FX-1? I'm sure it its.
You would first have to do some measuring of the fx1 exit nozzle and the others to see if it would even be close to being compatible and working.
What size is the Fx-1 pump isnt it 122mm?