Q: Will this work with any rear disc caliper I install?

It's designed to adapt the factory Mustang parking brake cable/lever setup to work with modern integrated-parking-brake rear calipers, but caliper design, mounting brackets, and the parking brake actuator lever vary. Confirm your specific caliper's parking brake cable-end style is compatible before ordering.

Q: Does this kit include the caliper, brackets, or return spring?

No, the kit is cables only. The caliper, its mounting brackets, and the parking brake return spring are not included and need to be sourced separately (they typically come with the caliper/bracket kit you're installing).

Q: Will I need to modify or splice the factory cables?

Depending on your specific caliper and mounting setup, some rerouting or splicing of the factory parking brake cable may be needed to reach the new adapter cables, and you may need to secure the cables along their new route. Follow the instructions included with your caliper/bracket kit for the exact routing on your car.