You might want to double check on those ends. I also have the RK steel tie rod and I use the Moog ES3624. The ends you listed would use a 7/8-18 RH jam nut. I'm sure you can get at many places, I would just call Ruffstuff if you can't get one locally.
If you are using the ES3624 then the thread would be 1-18 RH. If I were you, I'd call RK to see if they ever made a tie rod that accepts a 7/8" tie rod.
If you are using the ES3624 then the thread would be 1-18 RH. If I were you, I'd call RK to see if they ever made a tie rod that accepts a 7/8" tie rod.