This is a rear pillow control arm ASSY with full length adjustment using a turnbuckle.
Rod end pillow balls/spherical pillow balls are placed on both ends of the control arms, and the weakness of the genuine rubber bushings, the weak torsional rigidity, is greatly improved by using pillow balls, and it directly responds to the handling, which is an advantage of the S660's midship layout. The effect can be felt immediately when cornering on mountain passes or circuits, and the movement of the suspension can be felt severely. The adjustable type allows for precise toe-in adjustment, expanding the range of circuit settings.
The adjustment range is from -5 to +20 mm.
It is introduced on Ameblo's M&M HONDA "Honda Honki".
https://ameblo.jp/mandm-honda/entry-12194498969.html