IMO, I would probably buy used aftermarket springs, if they were not too old, but I would never buy stock springs used. Several stock Contour springs have broken and had to be replaced.
-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