replacement rear wheel simulator

I need to find a replacement simulator for my right rear. Prior owner apparently was too close to curb a couple times and I have some jagged edges on the simulator. I have 22.5 inch rims & would like to replace just the simulator that covers the actual rim. I don't need to replace the the part that covers the hub.

I'd hate to have to buy a rear set (single rear axle).

Any ideas or suggestions? I need to get the rim size off the actual rim so that I can get an exact replacement.

Thanks for any ideas or suggestions.