From the early 1950s until about the time of the introduction of the outside plug 250 engines in 1959, Ferrari used the black Magneti Marelli B-7 design coils. These were slightly larger than the B-5s and again had the mounting bracket spot welded onto the cans. The whole assembly was painted satin finish black and the aluminumB-7 tags were attached to the bracket with two tiny “u-drive screws.” The usual practice was to cut off the ends of the aluminum tags, at a 45-degree angle, near the end of the lightning bolts and then attach them with one rivet on each tab. I have also seen original pieces with full-length tabs and using two rivets on each tab. Blue aluminum Magneti Marelli B-7 coil tag.