For 1965 cars equipped with radios, two condensers were used, a C5TA-18827-A1 mounted on the alternator, and C3SA-18832-A mounted at the voltage regulator. The alternator ones mount was located in the center and is hard to find. The VR mounted one is marked with the part number stamped around the edge of the base in a semi-circle at the top and the number "648" in an oval in the center. No other marking is present on any samples I have.
In 1966 the part number was changed to C6OA-18832-A, marked the same way as the 65 one but included FOMOCO in script around the edge opposite the part number. Later versions had AUTOLITE in capital letters located in the center preceeded by a logo and 648 on the bottom in a circle. The VR condenser's mount is located at the end opposite the lead. The service part number for the VR condenser is C6OZ-18832-A which was replaced by D5AZ-18832-A. You may (repeat may) get a condenser marked C6OA-18832-A if you can find a NOS D5AZ-18832-A.
For 1964 Mustangs two were used but I don't have any marking or mounting info, just part numbers: C3AA-18827-A on the alternator one, and C3AA-18832-A for the VR one. As generators and generator voltage regulators were different from alternator equipped cars that the mounting tabs are different for condensers.
I've found two anti-static "springs" on bearing caps over the years. There was an I-6 version and a V-8 version (different bearing cap sizes). I believe that they were tossed when wheel bearing were serviced (too messy). I think that two were required and their use was discontinued for 1966 Mustangs.
Jim