fuel pump to tank 'O' ring

[umpkin]

Anyone have one of these they can measure for me??? its the big one that sits under the plate that bolts onto the top of the tank that holds the fuel pump and gauge sender, i need to change mine as it is fubber and stretched, but nissan want £11 plus VAT for it, i have an 'O' ring supplier at the end of my road, but need measurements for size.

I need Overall Dia and thickness.

Cheers.