It keeps spinning after I shut off the engine and makes a nasty grinding/catching sound when it does finally stop.

I did a search and have read several threads but they all just confused me.

What is the best course of action?

Should I upgrade to the plastic fan?

If so, what car was this on originally?

I just bought the direct replacement for my clutch on fleabay.

Can I bolt on a plastic fan to that clutch?

I really did try to figure this out without starting another thread but they all ran together and just confused me more.

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1993 W124 300D
-297K on the clock as I type this.