1965 Skylark, 300 engine. I'm having a problem finding an ignition switch that my key cylinder fits into. I can find ones that have the right blade configuration on the back, but they all have a different mechanism at the bottom of the barrel precluding my key cylinder from being installed. Is this a waste of time? Should I just give up and get new ig switch + key cylinder? Photos attached. Note bottom of barrel config and end of key cylinder.