3500lb Dexter 5-Lug Idler Hub with a 4.5" bolt circle that uses L44649 outer bearing & L68149 inner bearing (Sold Seperately).

***NOTE: WHEN FIGURING YOUR BOLT CIRCLE, MEASURE FROM THE CENTER OF ONE STUD TO THE CENTER OF THE STUD DIRECTLY ACROSS, SKIPPING THE ONE IN BETWEEN - THEN ADD 1/4" (ex: a bolt circle measuring 4 1/4" would technically be 5 on 4 1/2").