This is the fan you need to work w a fan clutch. They come in different diameter sizes and come In clockwise rotation and counter clockwise rotation. If you put a thick radiator in, you can use a Hayden 2765 fan clutch with centering bushing for a 1990 jaguar XJ6. Its shorter than the stock fan clutch. Helps make it fit better w thicker radiators..
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I read it was the Derale 17118, it looks pretty much exactly like the flexalite though.