These are some small caliper mounts that I made for the $15 Wal-Mart fog lights. I upgraded the bulbs to some inexpensive yellow Xenon H3 bulbs I scored on Fleabay so that they stand out better than the halogen bulbs that they come with.
I spent some time looking at various aluminum brackets on Fleabay until I found something that looked to be about the right size and were nice and thick so they'd be sturdy:
I trimmed them down with a metal cutting blade on a table saw and then drilled some holes in them that lined up with the mounting holes for fog light brackets:
Then I had them powder coated:
Given their thickness I replaced the caliper bolts to mount them with some bolts that are 5mm longer. (BMW Part 07119901064) Here's what they looked like installed:
On the road:
