From the description, that kit appears to be for the previous generation of Trackers (it mentions a "rear upper diff link spacer") - Altered Ego does offer an equivalent spacer kit, for a 2003 - there's no link I can repost, but here's a cut & paste of the text description.
Our 2" Spacer Lift comes with all you need! All coil spacers, strut spacers, extended brake line, rear shocks and panhard bracket.
Looking at that I'd say it's got all of the required pieces, which is something that I cannot say for all of the kits out there - regarding the struts - if yours are relatively new, you could hold on to them, if they are the originals, it's time for a change.