Floppy to USB

I have a 2006 Haas Mini Mill. At the moment it has a 3-1/2 floppy drive on it. Im wanting to change it to a USB.
I also have a 2009 Mini with the USB. It looks like its just an USB extension cable ran to the back of the machine.
My question is, does anyone know where I can get the cable, with out going through Haas. I would like to buy one from Amazon or Tiger direct, but Im having a hard time finding one with the right female end. It needs to be round and threaded, along with a thin nut.
Thought I would give this a try before calling Haas.

Thank you,