I don’t thing it’s wear if they are not centered. I think the spec was 12.5 mm on each side of the arm. That is almost impossible to get exact, my new mounts are off by +/- a mm or 2. On interesting thing is that it’s a hydro mount, when I pressed out the old one I had to push the rubber part out of the sleeve about half way so I could line up the new bushing, anyway it poured out fluid from a chamber inside. I think the first sign of wear will be the crack you see in my photos, the second will be fluid leaking. I think by the time you have fluid leaking you will have significant change in how the car feels.