Am doing the very thing right now.
I am replacing all of the ports and deadlights on my 1975 30, Hull 33. (Great Minds Think Alike). I wanted more ventilation in the main cabin so I also am replacing the deadlights there.Originally I was going to Bomar opening Ports in the main cabin. Note: Bomar calls these special order so returns will cost 20% of the price.My wife and I changed our minds and are going with bronze ports from New Found Metals. 4 5X12's including the replacement of the wet locker deadlight and 6 6X20's (3 on a side) in the main cabin.The final caution: 1975 Hunter are only 3/8 inch thick at the windows (no sandwich) and will require a beauty ring or shim to allow the bronze ports to clamp properly.BTW, The Bomar Ports were beautiful, but we liked the look of the bronze for us and we have a good fiberglass guy to help. When done, we will include pictures.Bill Boyke