Hi, yes ready stock available for all stock spring coil.
It does improve absorb ability obviously especially on cornering and uneven road.
By divided immediate impact when crash on uneven road the suspension work less and go smoother.
But will not just make suspension become harden.
WAYTA brand design with more elastic to prevent this situation.

yes it did fit on all car with coil spring.
CC is not important unless some special model if encounter i will mention it.
Just let me know of the car model you will need.
The front and rear of each car is RM 90 include west malaysia postage.
Sure would hav special price for bulk purchase and depend on quantity.
We can discuss through pm on this.
Ready stock for this items and if needed can be post over tomorrow.