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I would think that the 0 is a 9 and its just not stamped deep enough as some stampings are hard to read as tooling wore down and that's a late date so some of last Shelby shocks made and I have never seen a 70 date shebly shock nos or service replacement. The other difference between 68 and 69 shocks is fine thread to coarce threads. Also if u have a 68 kr 4-speed it don't use adjustable rear shocks.