The Gravity Boots are only compatible with inversion tables that use the T-Pin Ankle Lock System (FitSpine X1, EP-560).
If your inversion table has an EZ Reach Ankle Lock System (FitSpine X2, X3, or LX9), you would need to purchase a new main shaft with the Gravity Boots Adapter Kit in order to use them.
Gravity Boots with Adapter Kit (Compatible with X1 and EP-560): https://teeter.com/product/gravity-boots-adapter-kit/
Main Shaft with Gravity Boots Adapter Kit (for converting inversion tables with EZ Reach Ankle Lock Systems)
https://teeter.com/product/main-shaft-gravity-boots-kit/