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This Fel-Pro Engine Oil Drain Plug Gasket fits your 1959, 1958, 1957, 1956, 1955, 1954 GMC M300 4.1L 4.4L 4.7L 5.2L 5.3L 5.5L 5.7L 6.1L 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.