Which of these two fans?

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go-fish

go-fish

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One is a Derale and one is the one that came on my truck. I will also be using a Hayden HD / Truck fan clutch. Radiator is a stock replacement heavy duty.
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All the clutch type fans I've seen have the large center hole and bolt pattern?
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Yours look like straight mechanical fans.
 
Neither one will work with a clutch drive. Both are direct drive. Clutch drive has a much larger center opening.
 
Doh! Thanks for pointing out the hole size. The truck is a 76 D100 318.

Gotta get a new fan AND clutch
 
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