Those are nice vents, Chef; but, once ya add the cowl it ends up well past $300 per unit!!
True story: When we looked at what was to become Victoria, it was a cold, rainy day in early March. The PVC cowls were dirty, cracked, and wet. The broker commented that the boat was just aching for stainless replacements. It may have been an intentional visual plant in my brain on the broker's part (a common sales technique), but it worked. So we bought the boat and along with new interior lighting and battery charger, 6 SS vents ($$$) were the first upgrades to our "new" boat. I'm a sucker for shiny things.