And then have no shock travel?
Commo shocks will keep cut springs in, up to about when the tyre is level with the guard (depending on rate, and same rolling diameter as stock).
The only way sierra's work is if the car is ultra low, like 40mm rail height. Which will be shite
Also, if you actually want it to handle, you could talk to Dave at AJPS, and get a proper set of springs and short boge shocks to suit