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The Euro Clover Leaf rim was obtainable in Season 17: "Exploring Europe" by reaching level 7.
As the main hoarder isn't looking for these anymore, the demand for these rims has fallen off significantly, with it now being similar to other minimal demanded items (such as Jetpack or Frostburn), instead of being better than them, like it used to be.
Supply is widely distributed — no single holder owns enough to register as a hoarder.