I contacted Cosmo who use 8mm aluminium brackets for their kits, they say, to enable riders to stand on the foot pegs.
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Yep, me too and got the same reply
And that is one of the reasons why I bought from Cosmo
Answered first email in about 10 mins
Stuff arrived from Greece in 2 days despite Lockdown
Quality is superb and I can confirm that the plates are about 8mm thick
Also got their GPS mount which looks pretty good and will fit with an Airflow
Have not tried it yet for the dreaded "vibration", but if anybody is interested I will report back