I believe its M10 P1.25. I got a shift knob off of Sport Compact Only and it thats what it said, and it fits snuggly.
Still waiting on those pics!! i'm on my way to pep boys -_- to see if i have any luck finding somethin that size on sale.
$40 RAZO it was the universal one with the plastic inserts, at first i thought oh great this is gonna be gay, but it turned out pretty awesome. i put the insert in along with the spacer and it actually fits perfect without any bar showing. it was a bit jiggly but me being mexican and having an urge to fix shit i unscrewed it and put some tissue where the inserts go in so it can grab better and vuala its stiff as can be
A lot of the universal shift knobs will still fit, because they come with adaptors to help out. I'm an idiot and was still able to successfully put in a Pilot knob with a 7 color LED. Here's a pic of one of the 7 colors: This is what it looks like in the daylight (with the LED off)