I had one of these on my Vette that I just sold and liked it. I typically prefer a pistol style, but this big 2.25" Knob just really feels good in your hand...
Seems to work great in the Z. Get em here for about $40 shipped:
http://www.epcomfg.com/shiftknobs.html Tell them what pattern you need, and that you want a 10 x 1.25 Metric thread insert...Have fun!