It's oval, so I cut some Marley downpipe at an angle to copy the angle of the aperture. I used the existing foglamp bracket to fix to and pop rivetted the brackets to the pipe O/D, which I have have just measured and is a miserly 68mm!
I could go much bigger but did not want to increase the hole size incase I reused the foglamp.
The idea was to try it and then take more time to see if I can find a better place to create a permanent aperture.
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