Replacing the ABC system with coil over struts



I just purchased this not well maintained 2004 SL-500. The first thing I saw was a sagging front, so I am in the process of rebuilding the valve body at the front. After that I will see the effects. If no good, I will replace the ABC system with coil over struts. Bilstein sells replacements for the struts and I am here wondering if anyone who has done this job and has just purchased the struts and re-use the OEM springs..! That sounds like more economical than buying the whole assembly, but have not tried yet and not sure if that will work. Your wise comments will remove the dust cloud over this issue..!
Thanks
Imack


