This new tether was made to swivel better at the kingpin during installation. This tether mounts thru a stud that goes into the kingpin and secures with a jet nut. The old style tether was held on with a bolt that went into a kingpin. When you would tighten the bolt, the whole tether would twist and want to knot up. Old and new styles are legal for 2021. The old one is less expensive so we will be keeping both styles in stock.