In case anyone else is looking for the caliper mount bolt size, the Chevy factory C5 caliper mount bolts are M14x2x47. The Chevy dealer didn't have them in stock but Fastenal had some M14x2x50 grade 8 cap screws (actually the metric equivalent whatever that is). The 50mm bolt with a flat and lock washer is a perfect length and they not actually fit the bore in the spindles.
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