To late
They call that the driveshaft. The things on the ends are typically called U-joints, unless Ferrari has some sort of other approach. I just replaced them on my Toyota Pickup - real fun job. Ray
Probably a couple 100 in bearings and maybe coupler bushings from another car like a vette or alfa romeo would have done it. We fix those all the time in 2000+ vettes.
The part in your drawing is correctly referred to as the drive shaft or the torque tube. It has CV (constant velocity) joints at each end. These joints are lublicated with a heavy oil or grease and covered with rubber boots to retain the lubricant. If the rubber rips or tears, then you have an oil leak. The normal repair is clean and lubricate the CV joint then install a new rubber boot. Unless the CV joint has failed due lack of lubricant over an extended period of time, there is no reason to replace the CV joint or the drive shaft. You might be spending a lot of money on parts that aren't needed. I also recommend gettting a second opinion from an independent foreign car repair shop.
It is a drive shaft. A torque tube is a hollow tube solidly attached at one or both ends to maintain alignment between the engine and transmission or in some cases between transmission and differential and has a drive shaft running through it.
Since you have already bought the replacement drive shaft, the best option at this time is to proceed with the replacement. Many dealerships like to do replacements rather than repairs. If one or both of the CV joints are bad, a driveline speciality shop can remove and replace the CV joints and rebalance the complete assembly. An independent repair shop might be more inclined to repair the part rather than doing a complete replacement. Usually a repair is less expensive that purchasing a new Ferrari part.