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I scored mine off eBay, so it was CHEAP. This is what I’m using. Derale PWM Electric Fan Powerpacks 66833. It works great! I would get the updated temp sender, it sticks to the bottom radiator tank. You can get the 4K version, but my 472 is cooling just fine at 3750. The dimensions listed are what you should go by with your inside dimensions on your radiator core.