If you'll post a picture of the under side of the covers where the breather hole is supposed to be, we can give you an idea about how to drill them. If it's made like I think it is, you can probably use a hole saw with a hand held drill, but we won't know for sure without seeing them. Telling someone you've been given no detail is kinda dumb when you yourself haven't posted pictures like you've been asked already. We can help, but we have to know what we're looking at.
