If you're talking about the built in extensions on each side of the inner race, they simply add distance between the corresponding mounting tabs. If you mount a standard swivel rod end (Heim) directly between two brackets or tabs without using spacers, the body will hit those mounts before the ball angle is exceeded. Again, if this is what you are talking about, these are what "industry" (not ours) call "high mis-alignment rod ends." These rod ends do not swivel any more degrees than standard rod ends. Swivel rod end angles are rated by overall body clearance, not ball movement angle. If your A-arm rod ends are not mounted perpendicular to the bolt through the ball, you may need these or standard units with spacers. You need to check the amount of degrees of twist as viewed along the threaded shank section of the rod end as it moves throughout the entire travel.
<font color=orange>The best ideas are the ones that look obvious to the casual observer.</font color=orange>