I have a pair from my ex-XR, these are 2 pieces. For a 2020 RR the screw is wider so for the time being I used the original screw and mounted only one of the two elements the one in the inner side. That piece is ready heavier than the OEM. Will check how it compares as I did it only on one side.
So could mount both just I need a longer screw that fits the bars.