You can get Walbro parts through the Outdoorking online store.
Some mower dealers keep the kits and some don't. I don't know of Walbro distributors who will deal with the public. Generally, the online store will be considerably more knowledgeable and more helpful, but there is a minimum mail-out fee of about $20 that hurts unless you buy a fair amount of stuff in a single order. It is great if you want a fairly expensive part, or for the people here who work on lots of engines and have a reasonable throughput of parts. Obviously dealing with a helpful expert is way better than dealing with someone who is neither of those things.
Here is what a WA/WT overhaul kit looks like, rather than just a diaphragm and gasket kit:
HERE It has a metering needle, metering lever, and some screens and welch plugs.
