| The oring you seek should be obtainable at you local Napa parts house. They normally carry oring selections. Any good parts house should have selection in plastic box of all sizes, make sure you tell them its for gasoline. I lost one of those my self now that I think of it and I went to local Harley bike shop, not " Harley Dealer " Shop. They had several junk CV carbs laying around and the shop tech told me to find an oring thats good, give him a buck and have a nice day. Take Idle screw with you to size.
Good Luck. JP | 
