The Ford Racing IRS knuckle set for 2015–2016 Mustang is intended for custom independent rear suspension builds and is manufactured from cast aluminum with pre-installed bushings and steel roller bearings. These knuckles are built for use with Ford Racing IRS Mustang Cobra hub assemblies (sold separately) and provide the component-level parts needed when assembling a custom rear suspension.
Ford Racing 15-16 Ford Mustang IRS Knuckle Set