Each 3/4" thread steel swedged sleeve has a 1" O.D. tube, 0.095 wall, and 3/4" RH and LH fine threads.
When buying replacement swedge tubes keep in mind that each heim end adds approximately 1 1/2" to the overall length. If you have a heim on each end of the tube, the working length from eye to eye will be approximately 3" longer overall. As a rule, your tube length will need to be at least 3" shorter than your working eye to eye length requirement.