V20 - Side Recessed Panels

Great site! Finally uncovered my 1989 V20 boat from its winter hibernation. Started cleaning and making a list of TO DO items for this coming season. Does anyone know if the side rod holder recessed panels are sold anywhere. My panels have small cracks in the corners. Does anyone have any ideas for repairing these panels. ??? They seem to be made from plastic. I would prefer to $hit can them and buy or make new ones if anyone have any ideas.