Crossflow Engine Coolant Radiator with Transmission Oil Cooler (730) by OSC Heat Transfer Products®. Core Size: 20 7/8" x 19" x 2 1/4". Keep your engine cool with premium grade OSC cooling parts. Made to meet or exceed OE specifications, they’re designed to provide superior heat transfer and cooling efficiency as well as increased lifespan. Reliable cooling products from OSC go in as easily as the existing parts come out and deliver a perfect factory look along with proper function under vigorous driving conditions.