I used 3mm aluminum plate and put a small offset on the section where the socket mounts, so it projects outwards a little. It still uses the shock mounting bolt to secure it to the bike, as usual.
I can take a couple of pics and maybe dimension a drawing if anyone is interested in making one/some for themselves?
( I haven't worked out how to post pics on this forum yet, but I'm sure it won't be hard....)
I seem to recall the kit cost me about $85 from BMW a couple of years ago and I guess the 'aftermarket' version has cost me alot less then that, but I can't say for sure.....
It was a fun exercise.

Sterob