Infiniti Nissan 350Z OEM Replacement Radiator Mishimoto has just released an OEM replacement radiator for your 2003-2.jpg006 Nissan 350Z. The Mishimoto OEM Replacement Radiators feature perfectly created plastic tanks with aluminum cores. These radiators are a direct OEM replacement and require no alterations. Mishimoto guarantees superior performance and quality with an unmatched lifetime warranty on all parts.