I wanted to share this since I had not seen someone talk about this compatibility, and thought someone may find this helpful if they wanted to extend the life of their boots.
In short:
The K2 Revolver Team GripWalk Outsoles are compatible with full tilt 2013+ pro models (Soul Shell).
Link to outsoles: https://k2snow.com/en-us/p/revolver-team-gripwalk-outsoles
Full story if you're bored (I'm just excited that I get to keep using my favorite boots):
I recently had some look pivot 12 GW (GripWalk) mounted to my skis and was told by my local shop that my ski boots were not compatible with my bindings, and I would need a new pair since mine were beyond the point of repair. I started looking into new boots and wanted to keep the same shell type as my current 2014 Full Tilt Seth Morrison Pro and was looking into the new K2 FL3X line and noticed that they use the same "Full Tilt Soul" shell with the updated GripWalk outsoles. I couldn't find a shell that I really liked, with the intuition wrap. I then found online that K2 sells the GripWalk outsoles for the "Revolver Team" model in their parts department, but couldn't find anything online about someone using these outsoles on older full tilts. They were only $40, so I figured I would give it a shot and see if they would fit, and it turns out they do! The swap was really easy, I would recommend that you reuse as many of the old screws that you can (they were able to seat better than the new ones). I think the upgrade came out pretty good and I'm excited to extend the life of my Full Tilts. Hope someone finds this helpful.