You need to go to an online parts web site - eg. Partzilla - and search through various "fiches", which are the blow up pictures of various ST components, all with the little numbers indicating the parts involved. If you have the carbs out now, by having a good look in that space, you should be able to identify whatever parts you think you need from those fiche pictures. The elbows, o-rings and hoses are under the cylinder head fiche. Once you look around the various fiche headings, you will find everything you may need for your bike.
This will save you, and everybody here, a lot of time going back and forth with the posts. Not that we aren't here to assist in some decisions, or advice, but learning how to use those fiches is mainly for your own benefit.