Hotchkis 22390 Sway Bars, Set, Blade Style, 63-72 C-10 - Manual (Page 18)

With the end links attached to the sway bar, adjust the length of the end links so
that the sway bar lever arms are near level when the lower rod ends are in the
center of the trailing arm. Also make sure the end links are vertical. Mark the
hole center and drill the trailing arm with a 3/8” drill bit.