The year of the 2300 SCR would be helpful. The type of portlight and the model could narrow it down too. If unsure a picture might narrow down the search. For example, I have Bomar portlights and hatches, though I was not sure of which models. I went to this site which shows a number of Bomar portlights and hatches:
Note that Pompanette owns Bomar.
I then found an image that looks identical to mine and it seems I have the Bomar 5000 series portlights. My latches use 'snapdogs', so my next step would be to contact the folks at pompanette to see if they sell replacement snapdogs for a Bomar series 5000 portlight. I'm not sure what you've got, however I hope this helps some.