i've run h&r spacers on my audi a7, and nissan GT-R with no problems. the only downside is they are a tad on the heavy side. CNC billet spacers would be the way to go. i ended up switching the GT-R spacers for some custom milled billet spacers from
http://www.motorsport-tech.com/ they're probably the nicest spacers out completely custom and 100% made in the USA. the only reason i changed the spacers from h&r to the custom ones is i wanted an absolute perfect fitment on the gtr and h&r didn't have off the shelf fitments