Im trying to do the same to my bike. i have alot of mods an cool stuff done thats all i really have left to do. but i dont know that your talkin about for a part to convert what you already have. what i was told to do was to get a sub frame off a 2001 CBR F4i an the back fearing an seats an it will all line up.. so thats what im gonna try. so that way youll actually have 2 seats an look clean an sharp. good luck:]