Mould making is quite labour intensive so it works out expensive in this country - which is relative across the world. You can get parts made here if they can be turned on a lathe but once you move away from that it gets expensive

All the kits listed under Yamaha, Honda etc are for CV carbs, The kits listed under Keihin are for FCR. I don't know if they are suitable for Yamaha FCR as I haven't looked into that. Part numbers are available on each page.
cheers
Blair