D&R Marine
If you are looking for a used hatch, good luck. Finding someone who has a boat they are selling for parts is not commonplace. You might be able to use a stock hatch from West Marine by modifying the deck opening or the hatch. Your best bet for a good fit is to call D&R Marine. Rudy has the mold and will make you a new one. If you don't know, Rudy at D&R used to work at O'day and bought the molds for many of the old hulls and appendages. His website is drmarine.com.