I have a pair of strikers here. I know the one on the right is 69/70 as they are 90% of what I do. Looking at the one on the left, dated 1969, I have a pair of these, they came off a car I parted long ago. Was it a plant thing, a time thing ect. Both marked ACC and dated, but they are not the same. Any idea's? I did a search and found nothing on it.