Just for future reference it’s an original Mini grommet, thank you for your help chaps.
Nigel, this one ?
https://www.minispares.com/product/Classic/Grilles_Brightwork/Wipers/Bottles_pumps/BAU2043A.aspx?160503&ReturnUrl=/search/classic/grommet.aspx|Back%20to%20search
if correct, that's a great find
