you cant go wrong with a plain old black ball
smooth, simple, and CHEAP.
how cheap you say? they are 8 bucks!
http://www.blueovalindustries.com/products.php?pid=910
if you just slap it on you will have some threads of your shifter handle showing, i cut some threads off my handle so the knobs come all the way down and meets the boot.
so it makes the shifter shorter so it shortening the throw by a bit kinda sorta lol