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I used the jag clutch in my 67 Barracuda When I went to a three core aluminum Champion radiator. Much thicker rad then my stock copper/brass two core. I had no choice but to use the jag clutch. Otherwise my fan would not fit, would hit the rad. It bolted right up, came with a center bushing as mentioned above. Super tight install though. Not much room for fat fingers.... Lol.



The other thing you might want to do is make sure you put the belt over the fan blades BEFORE you bolt the radiator in.