Go2Marine stocks the Beckson Rain Shield, cost about $35.00 ea. They stick out about two inches, white in color. Nice boat you have, we used to own one back many years ago.
If you mean the Port visors. .. Check the linked website... they give inside of the visor width... so that has to be larger than the outside of the outside frame.
Also make sure you match the style of your portion. .. mine were round end but yours may be square?