Master Cylinder Pushrod

I couldn't find anything online that stated what the difference is. So I tore my 2 cars apart to find out. My 69 cuda that was factory drum/drum pushrod is about a 1/8" shorter than my 75 duster factory disc/drum pushrod.

69 cuda measured 6 7/16"
75 duster measured 6 9/16"

Thats from end to top measurement.