http://www.cachassisworks.com/Attach...XXX_DS_WEB.pdf
I am using a Vari-Shock setup, and it works very well. I have had many racers tell me my car leaves, and lands real well. The adjustment is real nice, and I can tell when I made an adjustment. I do not have any exp with the Santhuff stuff, but this is less expensive. I changed the std upper bearing to a spherical one when Installed. Part # VAS 172DP-952
Jason