For whatever reason, it has been hard to find both parts at the one site.

On first glance, I did find them together at this site :

https://www.xxcycle.com/abus-u-lock-...f-ring,,en.php
https://www.xxcycle.com/abus-u-lock-...-45342,,en.php

But the pricing seems annoyingly high.

Okay I just checked Evans Cycles and they do now have both parts(which they didn't a few weeks ago when I checked)

https://www.evanscycles.com/en-au/ab...acket-00104635
https://www.evanscycles.com/en-au/ab...xplus-00104637

Much better pricing, I would get this straight away before one of the items goes out of stock again.

I read the comment about the bracket chipping paint off the frame, to avoid this, do as I have done and cut out a bit of old tube and place it between your frame and the bracket.

This worked a treat for me, and I had to take the bracket off recently after having it on for a year, and there was no marking to the frame, no doubt due to the use of the bit of old tube.