Pypes Performance exhaust 67-74 Camaro SBC 2.5in Manifold Downpipes DGU14S 1966-chevrolet-k20-pickup-esi7081582 What size tubing do these

What size tubing do these brackets fit

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as well as for an OEM fit

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Pypes Performance exhaust 67-74 Camaro SBC 2.5in Manifold Downpipes DGU14S 1966-chevrolet-k20-pickup-esi7081582 What size tubing do theseIntermediate Pipes 2. 5 in Diameter Stainless Natural Pypes Exhaust Stock 3 Bolt Manifolds GM A Body 1964 74 F Body 1967 74 Pair Pypes Performance exhaust 67 74 Camaro SBC 2. 5in Manifold Downpipes DGU14S