I wanted to change my load a matic dizzy to a 64 f-100 dizzy so i got one from napa. the dizzy says Motorcraft and the # is12127.It has a triangular shaft and the # on that isE2 AE-12131-ca.I hope this fits my 56 292 cause i just spent money at Bubbas Ignition and had Jim re curve it. thanks,Mike