These all new GM Big Bore metric calipers are a re-design of the popular small piston S10 calipers. With the increased bore size you will get more than 20% increase in stopping power. New universal design allows it to be used on either the driver or passenger side. Bleeder screw and banjo bolt can be installed in either location. Calipers come loaded with standard D154 brake pads. These calipers can be used as an upgrade replacement on most 1978-88 GM mid size and 1983-02 S10. Can also be used on most Mustang II conversions