metal elbows are in the help section at most parts stores, they run about 10 bucks. when you change them, clean the holes out really good, use some 120 grit sand paper if you have it in all 3 holes.

then oil the o rings on the new elbows and slide them in. not sure what year you got, but watch them alt bracket bolts, use the long one in the wrong place and you drive it into the valve cover and make a nice hole in it.