I saw that solid shaft when I was trying to find out what pump I have.
With the part number 2129623 it's telling me the pump is from around 1962? I have measured the back of the pump and it's right at 4 1/2". So with the seal it would be right at the 4 5/8 you speak of. Now if I can just find out what it was used on? Thanks for the replies!
MJ