I have installed a Bilstein rear conversion kit (shocks and springs) on a '03 Escalade and an '04 Escalade ESV, and am 101% satisfied. Keep in mind It's a different kit for the Escalade and the ESV.
$300-ish from Rockauto and $300 for my local mechanic to install. Figure 1/2 day.
$300-ish from Rockauto and $300 for my local mechanic to install. Figure 1/2 day.