This is Garage Sale priced because it has been mocked up and returned. Spring is not installed, does not include slider bolts or brake pads.
These 1978-up GM Metric calipers accept either GM or Lokar type emergency brake cables. The fluid inlets are tapped to accept 7/16-20 banjo fittings.
Caliper measures 5" from the inboard side of the rotor centerline, and 1-3/4" from the outboard centerline.