The Roush springs are made to work with stock struts. I would say they will last a pretty long time. I will find out the first of the year, Im getting some too.
-Ken V.
1998.5 SE Praire Tan Zetec ATX
psycho_bass@hotmail.com
Roush springs Roush rear sway bar BAT struts 17" Millie Miglia HT3 and a ton of subtle asthetic mods