You seem to be correct. ACS does use Sachs shocks, but probably custom springs.
I wonder why SACHS doesn't sell the kit on their own?
E92 M3 DCT
- AiM EVO4 Data Logger / KW Competition 2-Way / OMP Racing Seats / Brembo GT 365 / Pagid Yellow RS-29 / Rear Seats Delete
For Sale: Brembo