I had an older model of this keyed/locking front door lever set and an internal piece broke, so I bought this thinking I could just swap one side.  Nope, this new one is totally redesigned.  So off with the old one and on with the new one, but thankfully the new one was easier to install.  One great feature is not having to turn and hold the lever out of the way in order to screw the inner and outer handle sections together. The new design has the screws at 12 o’clock & 6 o’clock for fast, easy screw access.