These mirrors are identical replacements for the originals, made by the original supplier to BMW. If your mirror is damaged, the mirror glass is loose or the stem is starting to rust, these mirrors are available as a reasonably priced alternative to the rather expensive Original BMW replacement mirror.
These mirrors even include the special nut that is needed to attach the mirrors and that makes them ideal as a retrofit mirror on R1150 RT and R1200 RT models. Left and right are the same, so if you need a set, please order two.
Here is a cost effective and simple solution: Install a pair of these mirrors on your RT and use them for a clear, unobstructed view of what's behind. You can then also adjust the original mirrors slightly more outward than you normally would, to see what's in the lane beside without having to turn and look. A win win situation.
The controls of the RT are technically the same as those used on other models (such as the various models listed above) and so they already have a built-in attachment point for mirrors.
R1200 RT up to 2009: