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On my F4i there were only really 2 options for the racks. First Was Renntec tubular rack and the second was Givi, I had a Rentec on my F3 but chose Givi for my F4i.
There is then a lot of choice on to boxes where a universal fitting plate can be used from your box of choice (£30 cheapo Ebay to £200 Givi) bolted onto your rack and Bobs your uncle.
Pics from my F4i