Probably not Rudy
Rudy at D & R Marine (the website listed in the prior response post) is a great source of info, but I doubt he has the parts you are looking for. Oday did not make them even back in the day. Kenyon made the boom and mast for the Oday 23, as well as for many other boat makers. They are still in business. Check out their website; they can probably tell you which of their standard products was used on the year of your Oday 23. As for stanchions, West Marine, Defender and BoatUS all sell replacement stanchions. They probably won't exactly fit the footprint of the old ones, but the old holes are easy to fill with epoxy. The bow pulpit and stern rail are more difficult; Rudy may be able to help you with dimensions, but chances are you will need to find a marine metal fabricator to custom make the parts. Another manufacturer's standard part might fit, but it seems unlikely. Good luck.