So the car is a '70?  I see on Rock Auto they list the same switch for the '70 and '71.  They have both Airtex/Wells and Standard Motor Products listed.  I've used a lot of Airtex/Wells stuff on my '89 GT project, mostly to replace connector bodies that have failed by depinning a replacement plug/pigtail and repinning the old wires into it.  This far I've had no issues with any of their stuff I've bought.  Might have used some SMP stuff too, can't recall exactly. 

NAPA should carry Echlin, which I've always found to be satisfactory for anything I've used it for in the past, and I buy a LOT from NAPA because they're five minutes from my house.

Last edited by TKOPerformance (7/15/2018 5:02 PM)

Yes it's a 70. 70 is the first year the Mustang had the ignition key in the column. The switch is located on top of the column right forward of the steering wheel in front of the dash. Still relatively easy to get to. Because of that the 70 wire harness down to the plug connection is long enough to reach behind the panel. On the 71 - 73 Mustangs and later the ignition switch is behind the instrument panel on top of the column and therefore has a shorter wire harness and a non-matching plug. So the wire harness has to to be cut off the old switch and attached to the new one. Not because I can't repin it but because I need the wire length. So mechanically it does fit but electrically it is for the later cars. I don't have a problem with that, I can change it. I just don't want to get another cheap switch that lasts only a couple of months like the current one that I have. 
Thanks for the thought rpm, it would be a lot easier to install a 69 switch. - (Doug) HudginJ3

Ah Ford and their one year only stuff.

On a 70, there is a small roll pin that attaches the key switch plunger to the actual ignition switch.  I had a 70 where that pin came out, causing your same symptoms. Hopefully it is a simple fix with no new parts as mine was.

I have the tilt column. It has a Z type rod between the switch and the key lock. I took the Z rod out and pushed the switch rod. It goes in but doesn't come out. It als has a gritty feel to when pushing it in and pulling it out. I thing the return spring is broken or there isn't enough grease someplace. Bad enough to want to replace it with a good quality part.