Megane 250 Rear Light Torx Screw Size/part number

Hi all,

I need to change a bulb in my tail light but the torx screw holding the tail light on the outside of the car is very rusty so I'm worried when I get it out it might not go back and so want to replace it. I know it's a T20 head but I don't know what the the thread sizes are and the length.

I have called Renault and they said they can't find it and don't have a replacement part looking at the system!

Does anyone know what size screw this is or what the part number is?

Thanks!

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