BEFORE you order the T-Grip,
you must make sure that the two (L&R) wood grip panels are both FLUSH WITH THE FRONT METAL STRAP from the bottom of the grip up and around the inside radius of the inside grip strap to the trigger guard.
If the wood grip panels are set back at all, and not exactly flush with the forward strap, then the T-Grip will NOT PROPERLY FIT! Mine were set back about 1/64" OR LESS and the T-Grip I got had an unsightly space along most of one side of the T-Grip where it mates to the forward portion of L&R Wood Grip Panels.
Tyler states this on their web site, although you may not notice it, or you may not understand what they are referring to. I read it but didn't know what it meant, so I figured I would try the T-Grip anyway.
After receiving the T-Grip, and happy as a clam, I tried it, it didn't fit properly, so I called Tyler. The woman was very friendly, but she did confirm that the grip panels must be flush with the strap, from the bottom of the (butt) up around the inner curve and to the trigger guard.
You can either follow the instructions and this information, or try it for yourself in which case you will either need to send the T-Grip back for a refund, or somehow try to modify the T-Grip to fit (which appeared a nearly impossible task).