I have a 67 Mustang Fastback, 390 w/PDB and with a separate hub for the two piece rotor. I am not sure they are original to the car, the production date is 4/17/67. Does anyone know the transistion date of the single piece rotor and if I convert are the spindles the same? The two piece rotors are really hard to find, unless someone knows of a source, Chockostang does not have them. Please email me; scode@mustansbymike.com Thanks,Mie