This is Differential gear set includes output gears (2), spider gears (2), spider gear shaft and carrier support.Replacement part for these models:Ford Fiesta® ST RallyFord® F-150® Raptor R™ 4X4Ford® Fiesta® ST RallyHoss® 4X4 VXLRustler® 4X4 BrushlessRustler® 4X4 VXLRustler® 4X4Slash 4X4 UltimateSla..