I bought this cooler for use with a hydraulic steering system. It was a little smaller than I thought it would be and I was disappointed that it didn't come with any assembly hardware or installation instructions. I imagined that the head of a certain size screw would fit into a groove machined the full length of the cooler. Once the bolts were inserted into the slot, they would catch in the slot and prevent it from rotating. This allows you to move them up and down the length of the cooler for more mounting options. Nice feature, but why did I have to figure it out myself? In terms of performance, it seems appropriate to help cool the PS fluid.