I think you're pronouncing it wrong; it's lee-ver, not lev-er.
They're all the same shape but one's upside down, to accomodate the 'handedness'. That is, they're all built the same way, but the right-hand leever is on the right way, that is, the correct way, but the left-hand leever is upside down, to enable it to be attached on the left side. If it wasn't turned upside down, and was attached the right way up, it would mean you, the rider, would need to turn your wrist upside-down to pull it.
That said, it might be that the left-hand leever is on the right way, that is, the correct way, not the right way, and the right leever is on upside down. If this is the case, please reverse all of the above orientations*.
*Unless you live south of the equator.
Or are you talking about the cut-out bit on the clutch? If so, it's so, if you drop the bike, it'll break at the cut-out and you'll still be able to use it. (If this is what you meant, why dincha just say so?!!!)
Oh, and my hands aren't the same: on my right hand, my thumb is on the left and on my left hand, my little finger is on the left. Unless I turn them upside down when I notice that there's a little more hair on the palm of my left hand.
