I have a 73 240z and the ignition switch is toast.  Can pull the key in any position and it gets stuck in the on position nearly every time.  Anyway, I ordered a replacement but my with has 2 wires, red/blue stripe that attach to a small switch located in the main switch.  I did a search and it seems these go to the "key in buzzer"?  I want to confirm this and get input on if I should remove it from the old and try to install it in the new switch or is there alternate wiring suggested.

It's the same electrical plug though right?  You just have two extra wires.  The plugs are all the same I believe.  It should plug right in and the two wires are extra.