whiteline anti roll bar

Picked up a rear whiteline anti roll bar today...
where can i get the bushes from as they look abit worn and what's the best setting to have it on when i fit it.... I've read middle is best is this true..

Do you mean whiteline bushes or alternatives as superpro do them for the anti roll bar in different sizes .

Just needs new bushes.. Any one know what diameter the bar is... Or even better point me in the right direction for new bushes

Pretty sure it's 22mm, and the setting of it depends on what you feel is best, a lot of people run the middle as its neutral with all the other mods done, I prefer it to be harder to make the car a bit more loose.