I mad a shroud that fits exactly over my heater core, and the 120mm fan I fan fits exactly INSIDE the shroud. So the screw I used were the regular self tappers that come with the fan. I then mounted the shroud to the case and it pressed the rad up in place very securely. Also try using foam tape around your rad for sealing and between the shroud and the rad.
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The Rage is Relentless
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