I just had a look here http://www.realsteel.co.uk/ and they don't seem to have anything. They seem to be pretty complete with what is available. owned by an Aussie ( or used to be)
It would be pretty easy to fabricate a plenum with a 90 degree tube bend and make up a plate based on the air cleaner flange. And then you could make the angle as you prefer etc.
Regards PhilipA
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