This seems to be a problem that comes to the surface alot. Some say that it's not feasible to put a T-board in a Rocking Trigger frame because of 2 contact points used by the latter. While no one has actually proven this, Scenario Dreams states that the Rocking Trigger frame is supported by the T-board. Read please: (Taken from Scenario Dreams's site)
Compatible with any ESP grip:
Kingman Rocking Grip
32* Icon E
Spyder AMG
Spyder Esprit
Spyder E-99
Spyder Imagine
Spyder Fenix
Spyder Pilot
Spyder Electra
Here's the site if you don't believe me.
www.scenariodreams.com/productpages/esp.htm
Enjoy.