I have noticed that there are a number of Alfa parts that are used on various Ferrari cars. The parts that interchange are lighting, switches, coils, door handles, trim and other electrical components. I know that Weber side draft carbs were used on early Lamborghini cars and some Ferrari racing cars.
I have seen various Italian cars like De Tomaso, Maserati, Lancia, Fiat and even Pegaso (Spanish car designed by former Ferrari personnel) that used parts that are found on Alfa Romeo cars. The only problem with buying parts that interchange with other cars is the price. I know that Marelli B200 ignition coils are used on some Ferrari and Lancia cars that are much more expensive. I looked a friend's Daytona Spider and commented that his car used 1750 GTV lighting components. I also realize that there might been some mechanical parts that interchange as well like bearings, windshield wiper motors and emblems.
Brico cigarette lighters!!!
Also, I recently tried to get my headlight/turn signal switch rebuilt. The guy was funny, he told me that he would build my switch for $600 and that it was a bargain because the same switch is in some Ferraris and he charges $1400 for those!!
A friend of mine owns a Daytona Spyder and a 275 GTB4. He did not tell me which car did not start but, one of the cars used two Bendix electric fuel pumps just like the GTA. I told him to take the pumps off the car and clean the filters. He said that he removed the pumps and cleaned the filters. The car started after he installed the pumps. I also told him to use gasoline preservative in all of his cars to prevent problems with the fuel system.
I should have bought a 1953 340 Mexico Spider instead of my new 1977 Alfetta Sedan. I test drove Ferrari and Lamborghini cars before buying my Alfetta Sedan. The cars were the same price and now the Alfetta Sedan has virtually no value compared to the other cars.