Not to down play the generosity of @
ducatiman, I want to add a great cheap source that all bike owners should know. Harbor Freight sells sets of Vinton "O"-rings for $10. They have metric kits with multiple sizes that I have found of fairly good quality. I have used them on my Ducati's fuel systems for years now with no issues. The first 2 o-rings I used for the fuel quick disconnects saved me more than the price of the kit and now I not only have several spares but many other sizes just in case.