our 54 drivers side splash pan is one piece with an approximate 3/4" wide roll that runs along the outside edge of the pan. our 55 splash pan is three pieces and also has the approx 3/4" roll running along the outside edge. neither our 56 nor both 57 have the roll on the drivers outside edge. both the 54 and 55 pass side splash pan lacks the 3/4" roll. looking for other owners of 54 and 55 to confirm my impressions. thanks,mike