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While they were probably specified to be there from the factory, I have seen few original cars with them. I'm sure the line workers threw them in the trash as it was one more step.
Having said that, I have documented them from 67-71 on all bodies. Here is an untouched 68 Coronet, notice the smaller 68 style washer not currently available.



Paul - I have seen the two different sizes used with no rhyme nor reason on various years...different vendors maybe? I have also seen those lock nuts installed upside down on a few original cars..... but hollow side up would be the proper engineering intent. The Guru's book shows a lot of cross-referenced shock numbers....most of them look correct