2004 ford mustang power steering fluid?

I bought a 2004 ford mustang 40th anniversary running great but the power steering fluid is gone bad when i spin the steering wheel i hear a fairly loud whining sound so ill change the steering fluid to see if it helps.
The problem is that the car does not have a manual in the little space trunk on the passenger side so i've been looking for one on the internet but cant find the exact one, can anyone tell me what power steering fluid i need to use that would work great i have one but it just shows auto zone steering fluid so i guess its a not so good one.
Any exact suggestion what fluid my car needs thank you.

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