Caster blocks (portal drive), left & right/ kingpin bushings (4) Replacement part for these models:

TRX-4® 1979 Chevrolet® Blazer

TRX-4® 1979 Ford® Bronco

TRX-4® 2021 Ford® Bronco

TRX-4® Equipped with Traxx®

TRX-4® Scale and Trail™ CrawlerTRX-4® 

Sport Unassembled KitTRX-4® Sport

TRX-4® Unassembled Kit

TRX-6® Mercedes-Benz® G 63® AMG 6X6