NGK G-Power TR55GP spark plugs, alloy construction, set of 4. - Brand: NGK - Model: G-Power - Part Number: TR55GP - Quantity: 5 plus 1 bonus - Features: Platinum spark plugs Thank you for viewing. I purchased these thinking they were for a Chevrolet Astro, but they were incorrect. They are likely for the following vehicles: Platinum spark plugs for Ford Mustang, Explorer, Chevrolet, Cadillac, Buick, Lincoln, Pontiac, Mercury I tried to replace one, but it didn't fit and the threads were slightly damaged. I don't know if they are usable.