Your Isuzu truck deserves the very best upkeep. Why? Because it helps you do your job right. This is a real truck that needs real parts. Keep it driving like it did the first time with Genuine Isuzu Parts from Monarch Truck in SAN JOSE, CA. As an official distribution channel of a comprehensive inventory of 1999 Isuzu NPR-HD DIESEL 4HE1 (RLY) Truck Parts and price-savvy FleetValue Parts, we have everything you need to keep your truck in working order. Choose parts from Monarch Truck and you’re free to focus on the job at hand.