Flex-a-lite 57001. It was designed to run flex a lite fans that mount in the cooling find on the tanks.
A factory fan shroud will need a fair amount of trimming to fit but it is doable.
I ran this in my '03 Suburban that originally had a 6.0, it had no issue keeping it cool. It also worked well to keep my 8.1 cool in the same vehicle. It has a very small leak on the driver's side. I decided to replace it instead of having it fixed. It's my family vacation/tow vehicle so I went to a radiator that fit the factory shroud for simplicity of repair.
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