One clue as to age of the boat is that you list a "CLASS #" of 1999. Boats built after November 1, 1972 have a 12-digit Hull ID Number molded into the outside of the transom, the Class# was part of that, but since you have listed specifically a class#, I would be pretty sure she is pre-1972. The fact that you list 1999 as the class# tells me that, based on hte fact that my 1969 Widgeon was Class# 1791, and O'DAY built about 300-400 Widgeons a year in those days, that she is probably a 1970 model. Does she have wooden seats? or are the cockit seats molded as part of the deck? 1963-70 boats have wooden seats, 1971 and later have seats molded as part of the deck. 1971-83 models have a forward deck level with the gunwale (top of hull), 1970 and older have only a narrow deck around the top of the hull.
Based on this info, I have attached a series of pictures of what should have been the original rudder. I also included one of my old Widgeon, that picture was taken in 1989, the 2nd season that I owned the boat.