Someone else will have to answer that one. They would have to have the same exact hull to work and I don't think they do.
Inside of each side is a set of bolted on "rails" that adapt to the ski hull. They are specific to that ski. Since Seadoos share so many hulls they were popular as you could swap out the ski. But all the new 4-strokes have new shaped hulls. So there is little to no chance it would work.
Mine came with seadoo rails and I ordered GPR rails and sold the seadoo rails. It was a pain but I made it work
Sorry new to PWCs.... aren't the 2007 Seadoo GTi and 2008 Seadoo RXT both new 4-strokes? The seller has the GTI setup now with the Shuttlecraft.
Thanks.