If the kit is original honda, some of the o-rings or washers shouldn't have a part number but just a letter. There should be a piece of paper that works as a cross-reference, indicating which parts -"letters"- are used depending on the bike.
Long story short, a given rebuild kit is used for different kind of carbs, and in Honda they just included all the tiny pieces needed for any of them, and the ones that are not used depending on the application are just meant to be thrown away -or whatever you want with them. At the end of the day, the customer is paying the not-used parts and it saves them the hassle of keeping inventory for different rebuild kits when one size can fit all....
If you do a search in the old threads you will find this question asked before, I recall having written about it before.
