8 3/4 brake line distribution block?

thanx 4 the reply, but what i am tryin to say is that i dont have the bolt with the vent in it and i need it. there was not one on my 7 1/4. the axle tube actually has a hole in it with this metal shield over it to prevent any thing from getting in. my 8 3/4 rear had the bolt, but it is toast.