I ended up buying the Dupli-Color Silver Wheel Paint. I have not used it yet, but
Josh49 claims a close match to the OEM wheel paint. You can find this paint in most Auto-Zone or Pep Boys stores.
Based on my schedule, I may not be able to get to my wheels until the week after Easter.
See this thread:
http://www.e90post.com/forums/showth...590#post801590
EDIT: I've spent some time Googling "Wurth Einszett silver wheel paint" and variations on that theme, and I've found a few interesting threads. I was toying with the idea of Einszett, but I have read more threads that says it's a little darker than the OEM shade. Another interesting thing I found is that the Wurth silver flakes apparently are a slightly different size than BMW OEM, so it is not an "exact" match, but it's very very close. I plan to stick with the Dupli-Color for now until the Wurth is available again.
http://mye28.com/viewtopic.php?t=251...2729ae224e417f