Starting in 2014 BMW changed the passenger grab rail mounts so our previous design wouldn't work.
We managed to borrow a late model RT, took a week plus, and perfected a robust mounting system. Here is a shot of the first live deployment,
This product is listed on our web here BMW Pillion Mount System.. There you will find that we call it a system because you can use the mount for an aux tank OR a luggage platform. We're currently negotiating with a vendor to make us a nice CNC fabricated platform.
We put together a product overview/installation video.
We didn't preface the tank removal with a plastic removal since we found a very well done HOWTO by JVC Productions,
Once you've followed these instructions you can tackle our HOWTO