I had the same problem too, and it's the easiest thing to fix.
Remove the wind deflector, and apply a small bit of foam tape (the stuff you buy at HomeDepot that stops doors and windows rattling in the wind). Apply it onto the small plastic bits that slot into the holders. It'll be a bit tight, but won't prevent you from removing it in the future.
To stop the black grills in the roll bars rattling, all you have to do is get some of those soft sticky pads that you put underneath chair legs to stop them from scuffing on wooden floors.
Quite simply, a small bit of foam padding with sticky adhesive on one side that fills out the space will prevent the rattling.
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