REAR SHOCKS W/ SS SPRINGS QUESTION

I am thinking of putting on Chrysler imperial rear shocks w/ the SS leaf springs. What year of imperial did the 68 SS cars have on them ? Was it 68s ? Has anyone done this & had any problems ?
I used 67 imperial shocks if I remember right. you might have to do some redoing of the bushings , I did. to make them work on my 68 form S car.