I put a T shifter handle on my Z. I love that thing, it took a couple of days to get the damn thing to fit, but it is great now. Very comfortable on the hand area. It is a billet one that says hurst on it.

 

I put in a t-handle last year with a switch for the juice. its nice, but at the track, when your hand starts to sweat, my hand slipped off 2 out of 4 runs on the 2-3 shift. I'm just going to buy a pair of gloves for this season, shouyldnt be a problem. The thread is 16mm x 1.5. I have mine turned towards me slightly for more comfort, but Im thinking about leaving it perpendicular to the car so as to not funk up the 3-4 shift. Well worth the 45 bucks...and i always get comments on it, usually good ones.