Rear shock mounting hardware

Ok, I'm trying to mount a set of Gabriel 43181 shocks on the back of my 74 Duster to replace the set that was on it when I baught the car. I ordered the new set and found that the previous owner had removed the metal/rubber eye ring and replaced with just a rubber bushing. I'm trying to keep the ring/bushing sleeve but they will not fit on the mounting current mounting studs upper or lower. Mounting studs are not original size. Does anyone have some actionable advise? I would like to keep using these shocks because I like the stance it gives.