ACDelco 12590958 GM Original Equipment Lower Intake Manifold Gasket Matching gasket sets available for most upper and lower intake manifolds for a proper seal to guard against leaks Designs are enhanced and amended to incorporate updates, upgrades, and Technical Service Bulletins GM-recommended replacement part for your GM vehicles original factory component Offering the quality, reliability, and durability of GM OE Manufactured to GM OE specification for fit, form, and function