One of the bronze tops for the vents on the ruffs is missing, but instead of replacing the vent, I'll remove the top from the other vent and put a Dorade box on top of it. In my opinion, this type of vent is among the most beautiful equipment on an older boat, and besides, they are very effective.
I already have the vents, so I just have to make new boxes. I'll leave the bottom of the old vent in place, and make a box out of mahogany in a way that the air inlet will sit lower than the top of the old vent. I could have just bought a couple of Dorade boxes made of teak, but I do not think they are particularly pretty - very angular and too tall.