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I have no idea what my radiator came out of but it features slotted holes top and bottom. Once I installed the supplied brackets to the fan and placed it on the radiator, they reached the four holes in the radiator perfectly. Here's the fan mounted and wired, and this picture gives a good indication of just how much of the core isn't covered by the fan. However, it did its job in extreme temperatures for over 2,000 miles, and I was impressed with its performance, but once back from Bonneville, I wanted to fabricate the shroud.