WTB Rockwell Delta 17-600 Drill Press Stop Nut

[likes68Cs]

I am looking for an extra stop nut for my 17"-600 Delta drill press (serial no. 1505836). I uses the micro-nut stop with the numbers on the edge. As near as I can tell it has a 5/8-11 thread, but I think the thread is ACME because a regular 5/8-11 nut will not thread on the stop rod. But 5/8-11 is not a standard ACME thread. However I have a couple pictures of the correct assembly, the stop nut, and the parts list. Let me know if you have something. I just want the nut for an up stop, I don't need the entire assembly. Thanks.