This is the 35 spline front unit bearing used in all Currie JK 1 ton front end applications. This unit bearing features the 6 on 5 1/2" wheel bolt pattern with 5/8" studs, is completely ABS and ESP compatible, and all of the factory JK wiring will reconnect with no modifications. NOTE: this bearing is based on a 1999-2004 F-350/F-450 Ford truck unit bearing.