Fuel filler pipe unsecured

On the recently restored to good health ZR TD, the nut that holds the fuel filler pipe in place is gone leaving the pipe flapping around (a bit dramatic, it seems to be fairly stable apart from when...) and I have managed to push it down once or twice when refuelling when jamming the fuel hose in it.



Does anyone know the size of this nut?



Now the car is back to full health, I thought I'd spend some time on little things that are bothering me.

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