Maybe your typo? But the 5/8 hose has no ribs.
I can't guarantee that the Vette's heater hoses are original but they satisfy the NCRS purists. The 3/4 hose is a dead match but the 5/8 hose is very slightly different than the Chevelle hose and varies slightly from the NCRS judging guide specs in the spacing. Splitting hairs here. - Bill W
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