Porthole Parts

I’m looking to replace a few parts on my Oval Bronze Portholes. Unfortunately I am not having an easy time locating information on the type of portholes I have. I’ve contacted several suppliers and no one can give me info or the name of the manufacture so I can track some things down. I’ve only seen a few BCC’s (which I think were mostly Canadian) with this type of porthole.

Anyway pics below. If you have any information it would be greatly appreciated.

Bryon & Maria
SV Cosmic Dancer