Anyone know of any mounting kits for the luggage brackets?  Not sure if I can go to the hardware store and pick up some nuts and bolts or if there are special spacers or anything.

Many thanks!

Look here for the appropriate metric screw and nut dimensions.  Note the spacers at the top mounting points.

Here's a link:

http://realoem.com/bmw/showparts.do?model=0503&mospid=51751&btnr=46_1269&hg=46&fg=54

Many thanks Two Wheels Better.  I went to my local Home Depot and picked up all the parts.  I had to make my own spacers, but my racks are mounted just fine!