updated steering linkage 64 barracuda

You shouldn't use the word "update" when talking about cars. It sounds like one of those hgtv buzzwords. When talking cars use terms like upgraded heavy duty tie rods and sleeves. The c-body setup is not needed on 95% of old mopars. I would not bother with them unless I was replacing all 4 tie rods due to wear.

If you are serious about changing to larger tie rods you need all 4 tie rods and the adjusting sleeve that connects them. I believe the car you will tell the part store that you need tie rods for is a 1975 chrysler new yorker. That should get you 11/16" tie rods. You can also buy them from a number of online vendors such as firm feel or espo. The keyword you are wanting to use is 11/16" mopar tie rod.