You will need to get the factory springs dimensions, and then peruse the Hyperco catalog to try and find a same dimension, but higher rate match.
I am trying to do this as well, to put them over an good aftermarket damper, but in less than an inch lowering of the factory ride height.
(IF this becomes an impossibility, I will just go with the M-Sport/Bilstein Motorsport R1 coil over setup, and get
both the gravel AND tarmac spring options with it.)
Just be aware that our factory dampers can only handle about a 215 in./lb. spring rate MAX, before they cannot control the spring's motions.