Don't go to Ford for something lke that, go to a local parts shop!
The rubber one they give you sounds like the thermostat one itself when it sits inside the huosing, and the "water rail cylinder head" one does not sound like the thermostat housing one. The water rail is the pipe that runs along the top of the exhaust manifold heat shield, but I can't recall where that leads to. Either way, sounds wrong.
You're right in asking for what you're asking for, it just sounds like typical Ford parts desk monkies who haven't got a clue getting it wrong...

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