The 1969-1976 steering lock rod is discontinued and very hard to find these days. The original part number was 7808614, but the later style lock rod used on 1977-1982 p/n 7808613 cars will work and while exactly the same on the lower end, it was shorter.
Since this rod is easier to find we’ve found that you can lengthen the later rod to 3 5/8″ and it will work just fine. You have to weld an extension on the rod and we use a hardened bolt to do this. Once we have it welded, we put it in the lathe and turn it to the correct size and length. Below is an original picture of the correct rod with the correct length needed.