OER Parts offers a wide selection of Manifold Hardware for your 1973 Chevrolet Chevelle. OER Parts offers 1973 Chevrolet Chevelle Bolts, 1973 Chevrolet Chevelle Exhaust Flanges, 1973 Chevrolet Chevelle Extension Pipes, 1973 Chevrolet Chevelle Header & Exhaust Manifold Paint, 1973 Chevrolet Chevelle Header & Exhaust Manifold Wraps & Blankets, and 1973 Chevrolet Chevelle Heat Risers.