I got the whole block apart and gave it a nice spray of fresh black paint today. Before installing the crank and pistons, i need to put in the new rear main seal. I am a little confused on how it works and havent found much info on what to do. The block has half of the seal and the oil pan has the other half in it, but the new one is one piece. Am I supposed to cut it in half so that there are two "half moons"? The FSM says to leave about 1mm out past the edge but I am a little confused as to if it is supposed to be cut in half? If it is, why wouldnt they just make the new seal in two pieces?