Where can I find one of these? I need some training wheels....

 

the grab bar is all you should need and i you are that bad at whelling you shoulnd be doin it

 

Like he said you dont need one unless you are going to drag race. I've always thought that it would be cool to have a wheelie bar when drag racing friends because i could rev it and pop the clutch and take off.
If you really want one somebody is selling one on e-bay for a 400ex and you might be able to adapt it to whatever you have. I think the guy who sells them makes them so he might be able to make a custom one for you for a good price.
hope that helps, and if you do buy one let us know how it feels.