It is a setting you have tested at HDC (artificial turf) the other day.

Set of ultra-soft eyes of 45 of hpi will be driving a easy to center differential.

(5) is necessary (A), the Ackermann plate of the OP rear damper stay.

* Ackerman plate (will be like), it is OK even genuine (4)

Sense of stability of the rear is a set outstandingly good.