This is the set of UPPER and LOWER insulators for 64-72 mainly Chevelle, some Malibu, El Camino, some LeMans etc.. look at what these are..
Usually for 350 Chev etc. .or 2 or 3 core radiators.
This set has ONE prong on each as shown.
This is a set of 4.
This set is 2.5 inches wide on the inner arch - you get two upper and two lowers. (The 4 core is - 3.1/8 inches wide)