which discs you want to use with 166 calipers? you must put 166's 310mm discs because of the surface of brake pads. 305mm disc also won't fit
166 calipers are bigger from coupes, and dics pads are wider.
i'm not sure, but if you put 166 calipers and 310mm disc, i think you can't use 20vt wheels.
hope i helped you a bit....
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