EDIT: A friend of the above friend said the following:I don't think it's worth it. I think clutch fork should work but the bearing probably not.
Nothing works. RB20 is the only one that is interchangeable. I remember on one of my old swaps i think I used some KA stuff. Oh yeah. White bunny flywheel ka flywheel and rb clutch. Have him search some white bunny stuff. Been like 8 or 9 years. Sorry.