So here's my old bits. The anti roll bar is tied to the chassis via 2 clamps that bolt down, in between the anti roll bar and those clamps are the bushes:
The drop links, ties the anti roll bar to the rear suspension (specifically the trailing arm and hub) via a bolt and nut for the lower end of the link and a nut that ties down the upper end of the link. It is one unit, as long as the bolt and nuts are supplied as well its all that's needed:
Don't know much about your issue but just in case you weren't aware you don't need to change the links if taking the anti roll bar off if they're in good condition. It of course cannot hurt to do so if you want to cover all areas at once.