This is assuming you need 73.1 to 56.1 below. Most aftermarket are 73.1mm.
Plastic:
https://www.amazon.com/Circuit-Perfo.../dp/B01JN0N3ME
Aluminum:
https://www.amazon.com/Circuit-Perfo...52WT8DW8CQ1SYS
Also, "wearing off"? I have a set that's been on a car for almost 20 years. Make sure you are tightening to the 89 ft/lb when putting it back on. Thinking about it, maybe you actually had the wrong size on there to begin with. What wheels do you have on there? The only way they should wear is if the lugs aren't fully tightened and those rings are too small to center the wheel on the hub correctly.