Is yours a ppv or ssv? The ppv were the police “street” springs and the ssv were offroad unless you had the nivomatic shocks, then they were a soft ride spring.
I found a 2017 Gm upfitter guide for the ppv and ssv. The ppv used a specific shock and spring.
The ssv with the offroad package used z71 springs and shocks.
So I’m thinking maybe it is just a z71 spring for the BP trucks.
I just ordered the z71 springs and bumps. I guess I can’t go too wrong with that.
Worst case scenario I have to look into the skyjacker or what ever 2.5 inch lift spring if these are not tall enough to run the front ADS coilovers at 2 inches higher than stock Denali.