try here [company name removed by Admin] if you can get them new they can order from japan they have them as avaliable $26. or put a post here in clasifieds shore someone using hrc jet kit will have standard + piece lying around.

hoses for airbox should be right not conected im shore there just breather for emmision (minimise gases into air) i think once you put + piece on you should be right. just check jetting once fitted as will have different air flow