Z Bar

push it right up to the chassis rail. add the spring clip and then move it slowly away until you see the spring clip ends sink into the grooves in the white nylon half moon bushes on that side.
I put mine in the opposite way - completely assembled the frame rail side so I knew for certain the spacing was right on that side, shoved the bellhousing side all the way into the z-bar so I had room to start the frame rail side stud, threaded the nut on the outside for the pivot ball, then pulled it back out until the pivot bracket met the bellhousing.