Our original plan was to mount the cooler to the factory skidplate. We had a B&M Hi-Tek cooler on the shelf that never made it into another project. They are made from aluminum and feature a fin and plate design that handles abuse better than a tube style cooler. The one on the left (PN 70298) is the one we had which features a 7-inch SPAL fan. But that would have been too easy a fit, so we ordered the big boy (PN 70297) with a 91/2-inch fan (right) to make sure the transmission is happy.