usct rear spring relocation kit

my superstock springs came in from jegs.
i asked several time if they came with all of the bushings and he assured me that they did.
it has bushings in the front but in the rear at the shackle there is none.
i also have the us car tool spring relocation kit and that doesnt have bushings for the tube that has to be welded in either.
what do i need to get?
can i buy them on amazon?
thanks