Hmm, funny u mention it...had a related concern when looking at everyone's pics. Many of them show a completely shiny polished 1/2" or so portion of the large diameter shaft immediately beginning at the outboard boot end with the remaining 1/2" or so weathered/surface rusted. When I saw that it jumped out at me as how could that be? Why is there such a demarcation line. Logic said the shiny section was (and maybe should be) covered by the boot. I could not progress on that thought track as soon as I saw that everyone's post repair pics showed the exact same condition.
A common design element to handle the horizontal tension on the boot/clamp attach point is to have a grooved channel that the boot/clamp seat into to provide better resistance to that force and to provide a better seal. Don't think this shaft has that but can't tell without a close-up of a failed unit where the boot/clamp are unseated.
So, didn't sleep at the Holiday Inn Express last night.
Here's yours after....