Set of six (6) fuel rail lower cushion seal rings (aka lower insulator) for Nissan Frontier, Quest & Xterra 3.3L V6 from 1999 thru 2004.- see table below. This lower insulator is located between the fuel injector and the cylinder head. OEM quality made in Japan. Free shipping to USA. Shipping cost to Canada is $8.00. Paypal accepted.