Hayden Automotive 678 Rapid-Cool Plate and Fin Transmission Cooler Size is 3/4 inch x 11 inch x 9-1/2 inch Pick-up trucks and vans, class "C" motor homes , travel trailers to 24 feet GVWR up to 24,000 pounds, towing up to 5,000 pounds Patented internal turbulation increases heat transfer with minimal pressure drop Pre-drilled mounting brackets for easy installation