They come with all the parts to mount and set them up. different spring, discs with 1 up to 4 holes, V shaped holes etc.
Assembling them is difficult as they are not well finished and e-clips don't fit, I broke a lot of them and in the end I stucked them to the shaft without properly snap them in. Anyway you have spares in the kit. Once mounted they leak, no matter all the O rings they have, they loose oil even if I don't use the car loosing efficiency. I have a full set of springs an mounting parts, but I will use them on better shocks.