Westfield Windscreen

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I wonder if anyone with a wide-bodied Westfield and a tape measure may be able to help?

I'm told that a Westfield Windscreen will fit onto my Road Runner Racing SR2, however my SR2 has a full cage and therefore there seems to be some uncertainty.
So, before I start the search for a suitable windscreen, could someone have a measure-up and let me know the dimensions etc of the screen please?