on the Caddy - at the back of the rotor. But for the Z you have to mount them up front. IIRC, there was a one off bracket done by a guy who swapped the calipers L + R which would result in the pistons running largest to smallest. I haven't looked in at least 2 years, but IIRC the setup from ctsvbrakeswap maintains the L + R calipers but swaps the bleeders and crossover lines.
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