Correct breather for cast aluminum valve covers

You can easily make 3 baffles, you have one for a template. I would do that, for all 3. If you have access to machine shop , or a friend that has a lathe and end mill, and has the materials , you can make what you need. Not too difficult to do, would actually be fun, that's unique to customizing. If you should go the way I have, the rubber plugs should conform to your irregular holes. I would still make the baffles. If you have peas, make pea soup, and it will look good when you are done, either way.