Purpose-built aluminum injector seats for converting OEM side-feed to top-feed fuel delivery. Engineered to the same specifications as Radium fuel rail kits, these seats press-fit directly into your intake manifold counterbore with zero modification required. The 14mm lower O-ring design pairs with the included FKM seal for consistent, leak-free performance across fuel system pressures. Sold individually—order one per cylinder to match your engine configuration. Essential upgrade for fuel system conversions demanding OEM-level reliability.