The extended travel spacer goes on the shock shaft between the shaft and bottom top hat washer adding around an inch of strut travel (2" at the wheel). Ironman used to offer these but now they just send you the spacer and you have to install yourself. The standard travel struts are good for a 1.7" lift although you will be able to dial the coil overs up to a 3" lift BUT you MUST preserve 60mm of downtravel on IFS's. Should be clearly noted on your install instructions. What I found with mine was that to preserve 2" downtravel I could only dial mine up to around 2" of lift. They sent me the spacer but it is a PITA to install as there are barely enough threads to get the top hat retaining nut on.Please expand on your statement, you've got me curious now. I installed just the pre-assembled coilover, no spacer anywhere.