Ponyboy, in the buy sell trade forumm, sells wico balltops that work for most. I had to shave a bit off the spacer but it was easy. I went with the 4" type and not the 3.5" and I am happy with the height.
As far as I know the only other option is the replacement handels on slikstik.com but they are expensive.
*edit* Dude 0 views and I'm still too slow.