Do you have the original cable? If not, I take it you have the schematic for the cable you want to build.
I recently had a scanner(Flatbed image scanner) break the connector for the light(for transparency scanning), so I had to chop apart the connector carefully and reverse engineer it. Darn molded cables!!
Anyhow, you could always peel away the molding and re-do it. Or if you get pressed, I have a few sources I would try. One is HSC Electronics at halted.com
The other is Fry's Electronics. I plan on visiting both within the next 2 weeks to get some small items. If you get frustrated, contact me and we could make arrangements. I can't imagine these costing all that much. Radio Shack might have it too and those are everywhere.