Allstar 9 inch Differential 28 Spline Lightweight Mini Spool for Ford fits a Ford with 9 inch differentials with 28 spline axles and is considered a lightweight model mini spool. The mini spool is precisely machined for proper fit, and then heat treated. The cross pin (Allstar part 68121) must be ordered separately. The unit fits a 1957-87 Ford with a 9 inch rear end with a 3/4 inches cross pin and 28 spline axles. It is backed by a 90-day limited factory and sold individually.