This is the only one you need to look up!
I'm a HVAC contractor, so I know alot of parts suppliers, when someone asks me where to turn if they want to do it themselves, the only name I give is Adam the Answerman. They are what the name implies. I use them myself.
I have NEVER heard them say, "we don't have it".
If you have a make and model #, they will put the right part in your hand!