Before you say that absolutely; What year were your inputs manufactured?
None of my pre-1971 inputs are like that, and I don't recall ever seeing that step before; but the newest shaft I have ever seen would be maybe a 1974. I have never had to replace an input. The only one time I ever broke one, I stripped the teeth off it, which then went thru the rest of the gears, so I threw the whole thing away.
Oh wait, I have a couple of od boxes, those might be newer than 74.
No matter, the bushing usually rides at least a quarter inch further forward.
