These tanks mount in the stock GM battery tray on the passenger side, or any standard battery tray with a GM style hold down. Made specifically for 99-07GMT800/NBS Trucks and SUVS. May fit other applications with minor work. Has provisions for standard battery mount hardware at the bottom. Can be made with either -10AN, -12AN, or 3/4"NPT bungs. Other configurations available upon request, filler cap and fitting locations can be changed as needed, for custom requests please contact before purchase.