Since I have a port off my '77 CP-16, here are the dimensions in case anyone needs the info.
OD: 5 1/4"
ID: 3 1/2"
Material: 1/16"? Stamped Gold Anodized Aluminium.
Mounting: 4 s/s screws, no interior bezel.
Very light, but not very cool... Would love to upgrade to opening stainless..
Mr. Toad, I hope I answered part of your original question.
Skip, you're forgiven...
Billy, Bob & Salty, keep up the great conversation and keep us sailing Com-Pac's!