1) I already had the current harness
2) I wasn't sure if the LEDs would be staying
3) Making the harness cost me nothing but a few minutes to make
4) I could have just used the stock 880 plugs, but see #2
Hows that?
If I do decide to keep these LED's, I will remove the old HID wiring harness/ballasts' and return to the stock wiring plugs.