Upgrade or replace your trailer hub with this Trailer Supplies idler hub, built for 9,000–10,000 lb general duty axles made after July 1, 2009. Featuring a precision-machined 8 on 6.5" bolt pattern and 5/8" studs, this hub is ready to mount with pre-installed inner and outer bearing races (382A and 25520). Designed to work with oil bath or grease-lubricated setups. Ideal for trailers with 16" or 17.5" wheels. Included: Idler hub with races and 5/8" studs installed Not Included (sold separately): Inner bearing: 387A Outer bearing: 25580 Oil seal: 10-51 (2.875" ID × 3.880" OD) Oil cap: 21-88 Lug nuts Only compatible with Dexter-style general duty axles manufactured after July 2009. Please confirm your bearing numbers and axle specifications before ordering.