I have the same problem Dirt. FYI, those plastic tabs make it a lot harder to get the inserts off, since they go through the insert. Drill them out. My plastic strips were gone, but I did find some replacements. Once they are off, they won't go back on with mechanical means, since you have to break them off. I was trying to save any pieces of the tabs if possible, but then you have to drill a hole through your new inserts, so eff that.
These are standard in Europe, and I see a lot of folks over there just gluing them back on once they re-do their inserts. This gives you a little flexibility, you can test fit them to see if they look good. I plan to drill out the old peg mounts to remove the insert, recover the inserts, then glue my strips on later.