Closed tube kits include solid axles, steel 5x5" hubs (WIN2255C) and 11. 75" dia. x . 810" thick rotors. Each 10" dia. , 12-bolt rear has a magnesium center with 6-rib bells (WIN8186P), Posi-Lock assembly (WIN8104), pinion nose roller bearing (WIN8143), 31-spline aluminum spool(WIN8115) and 4. 86 ring and pinion assembly. Package includes many popular options including WIN8106 Heat Treated Lower Shaft, WIN8131 Machined Side Tubes and WIN8133 Sprint Center.Pit Stop USA offers Winters 2.5" Grand National 2.5" Quick Change Rear End Kit - 62" Housing Width - 2" Offset - Includes 5X5" Hubs - 11.75" x .810" Rotors - Axles - Etc. K5063-62-2K at low everyday prices. Be sure to check out all of our products from Winters Performance Products including Winters Performance Products Quick Change Rear Ends.