Thanks guys. So, since my outside_to_outside measurement is 134, I want 131-132 length. I did check the diameter and pitch. It's old, but common - 9.5mm X 26tpi, and available in 137 and 141 lengths.

I've never cut an axle before, but I am thinking that the best way would be to put two nuts on each end (I'll likely try to cut the same amount off each end) and lock them at the correct length and then go at it with the hacksaw. Then, clean up the ends with my Dremel. Cool, this will need a power tool

Good comments all. Thanks again.