Rubber gromit for brakes

[RichardDean]

Hi anyone know where I can buy an 8mm rubber gromit to fill an allen key hole in my Mavic brake pivot (see picture). I have searched the web with no luck.
Cheers Richard

 

[fiveSixteenths]

This sort of thing?
http://www.ebay.co.uk/itm/20-x-M5-Hex-S ... SwRgJXmLXd