The part attached to the belt is the pulley. It should spin freely when the belt is not installed. The front plate is the clutch. It is linked to the compressor and only turns when the electromagnetic coil behind the pulley is engaged, forcing the clutch to retract and contact the pulley.
You can get just the pulley, but the clutches do wear out eventually. IMO it's worth the extra money to just get the entire assembly and replace all of it while you're there since you need to remove the clutch hub to get at the pulley anyway.
The Motorcraft P/N for just the pulley is F5VY-19D784-A and goes for $75 on Rockauto.com. The entire clutch pack assembly is F5VZ-19V649-AARM and runs for $115.
BTW - be sure to remove the snap ring holding the pulley on after you get the clutch off.
I've got an issue I've been working on on the Tbird for the entire time I've had the car; and I know it's a wiring issue somewhere.
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Hey guys, it has been quite a while but it's good to be back!
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