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This Fel-Pro Engine Oil Drain Plug Gasket fits your 1976, 1975, 1974, 1973, 1972, 1971, 1970 Plymouth Duster 3.2L 3.7L 5.2L 5.6L 5.9L L6 V8 and is perfect for a tune up or performance upgrade.
The catalog often lists the same model at several merchants — worth a price check before you buy.