Further to the post below can you put a rvf400 fairing on a vfr400? I'm talking about track/race fairings here and its not for road use.

you can fit them but the rear needs a NC35 subframe and the front needs the clock bracket and the screen brace to fit properly

If it's a track bike you can bolt it all up fine, just need a custom bracket for the front fairing (a bit of flat alloy bar etc). The tail unit will bolt straight up.

It's a simple job.