replacing a ballast help needed

I am trying to replace 2 ballasts in 2 connected fluorescent light fixtures in my bathroom. Each fixture is 1 bulb. the old ballast in each fixture is from Universal Manufacturing Corp. # 413-c-tc-p rapid start ballast for one f40w or f30w t12/rs lamp. The new ballasts that I was told to use by a home depot employee are Ge 140res120-diyb. Old ballast has 2 red wires out the right, 1 blue, 1 black and 1 white out the left. New ballast has 2 red out the right, and 2 blue, 1 white, 1 black out the left. The new ballast has an extra blue wire. The light fixture has 2 red on the right. On the left one side has 1 white wire and the other side has 2 white wires. The single white wire was connected to the white on the old ballast. Now the group of 2 white wires-1 of those white wires is the power coming into the fixture, the OTHER white white wire goes to a wire nut that has 3 white wires into it- the one from the lamp stand, one goes out to the next fixture and 1 is power. Not sure how to hook up the left side wires. I connected the red wires to the red on the right, I connected the black to black, white to white, blue to blue but I have an extra blue left over. Not sure the black, white and blue are correct. Thanks for any help!