Does the Ford dealership sell parts? Where can I find a petcock for my car's radiator hose?

I was working on my car a few weeks ago. I was replacing my radiator reservoir because it was spewing the coolant everywhere. When I was done flushing out tge coolant I went to go screw the petcock screw back in and it was like dry rotted and the top piece came off so it's just the screw part that's stuck in there. A few weeks go by and now my coolant light is coming on and the only thing that I can think of is the petcock came loose and now it's leaking or maybe the hose is leaking. Either way that screw has to get replaced. I've been to AutoZone and AutoWay and O'Reilly auto parts and none of them have it. It as made of plastic and the car I drive is a 2001 Ford Escape XLT V6. If I go down to the Ford dealership will they have one or should I just go drive down to an auto salvage yard?

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You can try the dealer, but most likely you're looking at a new radiator. Pros never open the petcock for this very reason. They remove the lower hose. Keep that in mind on your next repair.