This is a rear pillow lower arm ASSY with full length adjustment using a turnbuckle.
A rod end pillow is placed on one side of the lower arm, and the weakness of the genuine rubber bushing, the weak torsional rigidity, is greatly improved by using the pillow, and it directly responds to the handling, which is an advantage of the midship layout of the S660. 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 camber adjustment, expanding the range of circuit settings.
It is introduced on Ameblo's M&M HONDA "Honda Honki".
https://ameblo.jp/mandm-honda/entry-12194498969.html