These smaller sized terminal boots have been seen on some of the very early cars. They are the same basic design as the others but have a smaller 9mm O.D. barrel. They may have been used on the earlier cars or may have just been a different design from a different supplier. 9mm Wire Terminal Boots.
These small rubber boots were used on a lot of the wire attachment points such as the coils, generator, horn compressors and fan clutch sending unit. On my Cabriolet there are 12 or 13 in the engine compartment. This type has an 11mm O.D. Barrel and they were common in the 250 era. 11mm Wire Terminal Boots
When the new “outside plug 250 engines” were introduced Ferrari changed to the more modern spin-on type filters, again from the FRAM Company. These filters include the silk-screened sticker with correct information on the outside plug engines.
Enzo Ferrari always liked the wiring and plumbing to be neat and orderly. The plug wires on the V-12 engines were gathered together at the base of the distributor bodies by two small loop type brackets. The early cars used black steel brackets. At “about” the time of the change to the outside plug heads (Chassis near #1,500) the brackets were cad-plated. Each bracket had a rubber grommet to avoid chafing the wires and an “O” ring to gather the wires above and below the bracket. “O” rings to Gather the Spark Plug Wires