Rugged Radios - IMSA 4-Conductor 4C Circle Track Road Race Car HarnessUniversal IMSA car harness with 6 ft. helmet and push to talk leads. Rugged car harnesses with Total Shield are tough and keep you in the race with durable and reliable performance race after race. Rugged black Nexus jack Tough high bend test wire Universal 5 pin radio connection Standard 3 pin push to talk jack Molded Y block Total Shield RF blocking Use with the following Rugged Products: Helmet Kit HK IF or HK IFC Push to Talk PTT HM, PTT VM2 Radio