Examination of photos of the Cherubini 33 suggests several ideas:
There are a number of different port layouts in this design.
You appear to have an earlier "sleek" cabin and window design.
Like my '77 Cherubini 27, your ports are not designed to open, and have irregular shapes.
But the design of non-opening ports at that time had white plastic retainers on the outside and inside.
So you probably have a repair/modification of your ports by a prior owner. If so, and if they are leaking now, you are in a guessing and discovery game if you want to rebed the ports again to stop the leak. If you do attempt to rebed the modified ports, you may be on your own if you can't reuse the P. O.'s frames, as I am not aware of any aftermarket products for non-opening ports like yours (and mine, but check the store on this site to be sure.) I have been able to reuse the (now very brittle) white plastic retainers when I rebedded my ports to stop leaks a few years ago.
Good luck! I hope you get more responses from our h33 crowd!