We used new Lewmar standard opening portlights on our E27.
If memory serve, I believe they were size 1. They were not too horribly expensive, on sale at that time at West Marine.
They look almost the same as the originals. We had to enlarge the original openings but not very much at all.
It was not a difficult project, and they came out very nice. We opted not to use the trim kits on the inside because they very much matched the look of
the larger fixed portlights without them. Sorry, I don't have any pictures handy. The boat is on the hard for the winter about 60 miles away.
Good luck!
Bob Greene