Dexter (K71-148-00) Oil Bath Dust Caps - Application Specific Verify this fitment by measuring your existing caps to the dimensions provided below. Outside Diameter - 4" / Thread 4"-12 / Depth 1-1/2" Oil caps, oil rings and rubber plugs are included. Fits Dexter 9K (AFTER 10-1-89), 10K, 12K and 15K hubs. Read product description for more detailed information