I agree with Otis. This is a reproduction part and you can find them with a quick search.
I thought I had one but a search today came up negative.
The photo is of the rubber grommet and a 90° PVC valve as I am using on 2511.
The reproductions are about $60 and they sell for $40-$60 used on eBay. You can save some money by just using one metal breather attached to the carb or air cleaner and a rubber grommet for your PCV valve
Larry