I have a 75 duster, and this is what I did. I took the rear bumper assembly off, and drilled a small hole in the each rear shock. The shock is just filled with oil which is supposed to blow the end seal out upon impact to soften the collision. Then, I put the shock in a press and pressed it down as far as it would go, which pressed the oil out of the hole. Then, I welded the piston to keep it sucked into the bore, and reinstalled it on the car, and it moved the bumper in nicely. I only had to trim the "rubber" fill between the body and car accordingly to fit the new bumper spacing. The only important thing is to make sure you get both shocks welded the same distance in so that the bumper will hang straight. Hope this helps
