T10 / T-10, Driven Speedometer Gears.
22 and 24 .874″ tooth driven gears. The 23 and 25 tooth gears are no longer made.
These fit T-10, late fifties to late sixties such as 61 to 67 Corvette (not super T-10) and some Muncie. You must use this black drive gear to use these driven gears.