This is for the Classic Mini Clubman, its the grommet which goes between the metal 'legs' on the bottom of the clubman grill, into the body, to stop metal on metal action.
No longer available to buy, so I mocked one up and printed it out and it fitted nicely.
Fits on my 1979 Layland 1275GT Clubman.
From minispares, they are part number CZH614
Niche market! Hope someone finds it useful.