Koyo leads the radiator industry in quality, performance and fitment. Koyo engineers carefully design the radiators offering a true plug and play installation No drilling, cutting, relocating, or stretching to get their radiators to fit properly.These OEM Koyo replacement radiators feature plastic end tanks with a aluminum core, allowing for a cost effective option compared to the OEM units. Fits 99-05 Hyundai SONATA 2.4L I4 AT 99-01 Hyundai SONATA 2.5L I4 AT 02-05 Hyundai SONATA 2.7L V6 AT 01-06 Kia OPTIMA 2.4L I4 AT 01-01 Kia OPTIMA 2.5L V6 AT 02-06 Kia OPTIMA 2.7L V6 AT