SOLD
I have a set of used, excellent condition OEM rear rotors. They are currently 19.3 mm thick (measured between 19.25mm and 19.35mm thick with a micrometer). They were used only with OEM pads.
New thickness is 20.0mm, minimum thickness is 18.4mm. So these are worn 0.7mm out of a total of 1.6mm, or 44%, with 56% life remaining. And thats the OEM minimum. Granted, that is probably a good place to stop, but I recently replaced my front rotors, which were 0.5mm below minimum, with and still running smooth and strong.
They sell for $345, plus around $20 shipping. I'm looking for $100 shipped to the Eastern US, +$30 shipping to the western US.
They will ship double boxed in the rotor boxes my replacement rotors came in.
http://www.ecstuning.com/BMW-Z4-M_Ro...otors/ES11544/
<<<EDIT>> Now with photos showing excellent condition of the surfaces: First 3 photos are left, next three are right.