You will need some HD ball studs #91050, some HD ball cups #91051, and some HD 65mm turnbuckles #91038. Also, you will need some M3 locknuts #25215. The locknuts are not in the picture.
This is what the finish upgrade looks like once you are all done. I must say, the feeling of the rear linkage after the upgrade is amazing! The turnbuckle no longer rubs on the shock spring! Try it out for yourself and hopefully you will stop breaking that pesky rear linkage.
Good luck at the races! Remember, you can always ask me for help, just look for the KLA cars at the track.