Have you bought the adapters yet? If not I can probably save you some money... I know these can be bought at most places for about $49 but this place builds race car stuff and makes those adapters for $14 each.
Just call and talk to Randy. Make sure to tell him the 11/16-18 is RH (right hand) and the 5/8-18 is left hand. The length for these trucks is 5-1/4"
One thing no one tells you is you have to use the 65-70 OUTER as the INNER or you will end up with 2 ends that have RH threads (they won't adjust that way!)
http://www.dcaracing.com/cat_steering.html
Rg