Do I need a hardened intermediate shaft for a HV oil pump?

Well hopefully I don't need to ream it. I primed the engine today because I just wanted to make sure everything was getting oil before I drop it in this weekend (planning on priming it again before I start it too). The primer was made from an old intermediate shaft with a rod welded to it. It fit into the bushing really nice, I measure it with a caliper and it's the same size as my old intermediate shaft that I now am definitely not using!

If the old one fits wouldn't that technically mean that the new intermediate shaft should as well? If I have to ream it I will, but what's the best way to do that? Take out the bushing to not get crap everywhere?

What would be a good intermediate shaft to get, is there a common one that's decently priced but still good?