Part Number: MG186EA. MG186EA,F4TZ8255A,F4TZ8255B,F81Z8255AA,F8TZ8255AA,F8TZ8255AB. Part Numbers: 2289, 2289EA, 27289, 33670, 99186, MG186, MG186EA. Gaskets are made from high quality materials suitable for resistance to high temperatures and engine coolant to maintain a good seal.