Traxxas hollow ball, tall centered (2)/ tall offset hollow ball (2)/ bump steer adjustment shims; 3. 5mm (2), 1. 17mm (2) 38-5355 description: hollow ball set includes tall centered hollow balls (2), offset hollow balls (2), 3. 5 mm bump steer adjustment shims (2), and 1. 17 mm bump steer adjustment shims (2). Replacement part for these models: e-revo vxl brushless revo slayer pro 4x4 summit t-maxx trx-4 1979 chevrolet blazer trx-4 1979 ford bronco trx-4 chevrolet k10 high trail editiontrx-4 equipped with traxx trx-4 ford bronco trx-4 scale and trailcrawler trx-4 sport unassembled kit trx-4 sport trx-4 unassembled kit trx-6 mercedes-benz g 63 amg 6x6 trx-6 ultimate rc hauler