There "maybe" 4 with the 24 an earlier version, the 240 a later version.
A better place to look up O'Days, is I Heart O'Days
they have a pretty full listing with brochures, manuals etc online of O'Day boats some that one probably did not know they built back in the day.
going over and looking here is the list from 20-30' models, so only three in those sizes, a 240, 270/272 listed
Here is an alphabetic listing of the models of boats that the O'Day corporation
either manufactured or distributed over the years. It contains every model that I
have found mention of in O'Day advertising or elsewhere. It may be an
incomplete list, as new models seem to appear from time to time. I'm including
on each model's page the information I have on that model, but this is sometimes
very limited or missing entirely. If you have information to contribute, especially
if you happen to own one of the models for which I have no information, please
contact me. This information comes from a variety of sources and is believed to
be generally accurate, but cannot be guaranteed. Use at your own risk.
Click on the Ship's Wheel to go to that model's detailed information page.
Day Sailer II
Day Sailer III
Hinckley Sou'wester Jr.