Perhaps I should've clarified...

Those probably *could* work, but the 5mm ones linked above lack the built-in centering ring on the hub, like the 10mm H&R fronts do.

H&R 10mm DR Front Wheel Spacer 5x112/66.5/12x1.5 Mercedes Benz CLK W209 Chassis | eBay

Steve ran into this on his SLK -- he needed 5mm for a drag setup, and had to get some 10mm spacers machined down. Neither one of us got the warm-fuzzies about running the spacers w/o the hub lip. Some may not have a problem with it, but I've heard of balancing issues with the 100% flat spacers.

Price is right, though.