Bilstein ? Looks like it may have an application although it only lists the XL2500 for some reason.
http://www.truckspring.com/products...ban-Sierra-Yukon-XL-Hummer-H2__33-174525.aspx
http://www.truckspring.com/products...ban-Sierra-Yukon-XL-Hummer-H2__33-174525.aspx