Mike if you are referring to the pre-exup FZR 1000 Genesis then the yokes are a straight bolt in job with no stem swapping to be done. I have them fitted to my FZ. You are not limited to forks from the same bike. I have FZR600 forks fitted to mine but any 41mm forks that are long enough should do.
I believe there was a clutch mechanism fitted to the early race bikes which some people have copied. It replaces the hydraulic slave cylinder but is expensive to have machined from scratch.