I recently came across:
http://www.fabdirect.com/index05.htm
the lower control arm bearing looks interesting. I was looking into making something similar (I assume this one is threaded and thus adjustable caster...)

anyone make/sell these in the US?

I think these guys sell the same stuff
http://akgmotorsport.com/e36products.html

I'm not aware of anyone making one in the U.S. It's an idea that I had but never implemented on our car.