Re: exhaust port
If you can't find the gasket, use some grey gasket paper found in auto stores OR just seal it with some black silicone RTV. OR leave it alone. The water that drips out will run down the leg and eventually make its way out. Any exhaust that does exit through a broken or missing gasket will simply blow out the top of the shroud. So no, it is not absolutely necessary, but it is there for a reason and better if it is in place.