This is a set of the seal and lock ring.. its approx 8cm od..the other type are about 5cm.
This is the larger one .. fits
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1970 Camaro w/o EEC
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1970-73 Camaro with EEC
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1970 Firebird w/o EEC
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1970-73 Firebird with EEC
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1967-68 Bel Air (except wagon)
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1967-68 Biscayne (except wagon)
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1967-68 Caprice (except wagon)