Well, I got the grip and man is it sweet. Fits my hand perfect. Now I have to modify it. I tried again to see if I could get the TD rail for the SIR but I still can't. You would figure that both ARMS and TD claim to be mil-spec but these two popular items won't work together out of the boxes. I've alway considered it a shame when I have to modify parts to get them to fit properly. I don't know, maybe it's just my flawed thinking.
UPDATE Well, being the impatient type, I went ahead and took some file to the TD grip and made it fit. Works great
. Tight fit and no wobble. I want to thank everyone that helped and emailed me with pics/instructions on how to do it. Thanks again.