Cable for Rosewill PSU: Other brands will work?

[MushGuy]

I'm planning to upgrade the Optiplex's PSU with the one I already have, a Rosewill HIVE 650, but I'm currently missing the molex cable for the PSU. I've read that due to the lack of a universal pin-out between all power supply manufacturers, some PSU cables may not work properly with other brands. So, is there a way to find PSU cables that are compatible with my HIVE PSU? I've tried looking in Amazon, but no dice.

Edit: It's an old model that I have.