Does anyone know the exact application, or year for these 3 different "big ear" RC15 cap designs?
Picture is the 3 styles, and what I guessed to be their applications.

2 circles flat rivet. (1968L - 1972)
2 circles hollow rivet. (1966 - 1968)
No circles hollow rivet. (1964 - 1966E)
Does anyone know the true story?