You might try EC Carbs, I think they are a Walbro dealer. They advertise on Bobs4cycle above. I have purchased some of the hard to find parts in past years from them. Carrol Ford is the owner and is very knowledgeable on carburetors.
Thank you all. I PM'd Brian to get some coming. I must be getting too used to online ordering. It seems odd that no online store I have found sells this part.