The Green Bible lists the switch as part number 11A 15224 - a Unity & Appleton design with 20 amp fuse so they weren't really made by Ford and two different switches were used. No picture so don't know what it looked like. I used a NOS Arc-less switch for mine that attaches and works the same as the ones below.
Here's a cool looking one on ebay that clamps under the dash and has the fuse:
(Here:
http://www.ebay.com/itm/NOS-FORD-Lin...0088db&vxp=mtr)
And here:
http://www.ebay.com/itm/Vintage-LITE...90893418&rt=nc
This one claims to be a Unity switch so may be one that Ford used:
Here:
http://www.ebay.com/itm/Vtg-Antique-...09d26a&vxp=mtr