Timo raises some excellent points. My research with Dino's on their correct fasteners shows a number of trends but also some big differences between the early L and M series cars and the E series cars (that include all the GTS and USA spec vehicles). Compound this with cars being serviced over many decades and general Italian supply inconsistencies and you can at best discuss a guide of what is correct. Other marques literally have published manuals where every nut and bolt can be deemed correct based on supplier records. Ferrari in the 70's is NOT that kind of car so I caution anyone to take the contents of this thread as gospel.