The product is an OEM left-hand exhaust manifold for a 1975-1979 Pontiac Firebird Grand Prix Trans Am. The manufacturer part numbers are 499624C and 499624. This high-quality replacement part is designed specifically for Pontiac vehicles, ensuring a perfect fit and optimal performance. Perfect for restoring or upgrading your exhaust system, this manifold is a reliable choice for any classic Pontiac owner looking to enhance their vehicle's engine compartment.