That I don't know. I have quite a few free desktops here (school had a pile for recycling, find them on curbs, family/friends etc) so it never occurred to me that they would be hard to locate. I havent seen anything at ratshack that looked like a good fit, you could just solder wires to it also.
can get one from the orient for $1.68 too
4Pin IDE ATA Power Supply Molex to Floppy Adapter Cable - eBay (item 260568448049 end time May-12-10 19:17:36 PDT)