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
For the long distance races or others when there would be a chance for rain Ferrari would use rubber boots to cover the distributors to keep the rain water out of the electrics. There are good photos of the T.R.s using these boots at Le Mans. Small Distributor Boots for the Front – Mounted Distributors
The 275s began using the cast alloy wheels in the mid-1960s. With this configuration there was a small chrome-plated hub cap to cover the bolts used to attach the splined steel hub to the cast alloy wheels. The 275s and 300 GTCs used the small RW 32 hubs. These are the correct hub caps for these two models. The other cars used the larger RW 42 hubs and there are at least two different types of hub caps for them. Chrome hub caps for the 275GTBs and 330 GTCs with the RW 32 hubs
I looked and looked for correct Pirelli fan belts for my old 250 Cabriolet with no luck. Finally I made a silk screen jig and began silk screening modern belts with the correct old – style Pirelli information. My silk screen and jig can only do the long belts for the outside plug engines that had generators, and the very short belts that were used on the front mounted generators on inside plug 250 engines. Short Fan Belt for 250 Inside Plug Engines