No, I'm fairly certain the 180sx came with a larger, single-piston sliding caliper of similar design to stock usdm s13(q45's are dual piston).
There's been a thread on this here and on FreshAlloy, but...yeah, you can search for it =P
Going off memory...i think it's the maxima caliper + altima rotor thats the equivalent...or altima caliper and maxima rotor. Dammit.
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