Southwest Wheel 4-hole, 4" Bolt Circle Idler Hub for 2,000 lb. Axles (BT8 Spindle) 4 studs 4" bolt circle using L44643 inner and outer bearings. Contains inner bearing, outer bearing, seal, grease cap and lug nuts. Fits a BT8 Spindle (1" OD) Hubs are pre-raced &amp; pre-studded.