Can you explain how these are different? I have a 1978 Ford F-150 4x4 and these look EXACTLY like this. I did some research and people are saying its the same for 1978-1779. Can you tell me exactly what the difference is?

The bolt hole spacing where the coil cups mount to the top of the cap and radius arm, are in different positions for the early Bronco compared to the 78-79. Actually, the radius arm and C'caps are different. If you use the EB caps or arms on a full size or vice versa, the coil mounting cup bolt holes will not line up.