The early pushrod is a smaller dia. than the 8BA rod which is 10-1/16" long and the early one should not be used.
Most of the original 8BA rods are all steel and the ends are brazed into the tube.
Replacement 8BA rods have an aluminum tube and the upper end can be removed to allow the length change.
Determine what length you need and modify the correct 7/16" dia 8BA rod.
