Do you have specific LEDs you plan to use? When you said 2 V, I assumed you did. But now that I realize you're a water and modding virgin....
Different colors and types of LEDs need different voltages. Check your LEDs - what voltage and current is listed?
Yup, those Radio Shack diodes are great. The 3.3 V line is the orange wires on the ATX connector. The four-pin floppy and hard drive connectors don't include 3.3 V. Ground is the black wires.
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