So we're talking about these things, right? Not some straight rod?
No. The Redding dies use straight rod that is held in a collet that makes up the decapping rod. Just cut them to length and maybe round off the tip so that they don't just poke through the primer. I would only need rod of the appropriate diameter and something stiff enough that it wouldn't bend when used.
Up until this thread I did not know that Lee parts were basically free. Friday I placed an order for a bunch of parts I have been needing and some other stuff I just wanted. I had to pay shipping, and since I ordered four of each decapping rod that I needed I had to pay for some but the total was $60 and I will have several spares and also have everything I need to basically rebuild my lead pot and maybe stop it from leaking so I am okay with that.