I am looking for the printed instructions to install the adapter plate which allows the BMW Vario Top Box to mount over the existing rear rack on my 2012 R1200GS. I have all of the parts and it doesn't appear all that complicated but I want to do it right in order to minimize the risk of the top box spontaneously ejecting. Yes, I know it could still fall off no matter what I do but at least I will know I have installed it properly. I have searched this site and Google with no success finding the instructions. Thanks.