BMW R1200RT/R1250RT Forum

Here is a quick video of me mounting it to the base:

It actually fits fine. I have never had an issue with it, though to your point it does appear loose. I frequently commute with my RT, and take off the Carpuride prior to walking way from the bike.

Here is the attachment point. It snaps into the base.

Yes, the 502b snaps right in and is powered by the nav port.

I am 100% certain the 702b will not fit the 1200 LC models without modification.

Here is a picture or two with the 502b. I have a 2014 LC.