I just want to know 4 sure

.
But I have a little problem.
I planned to buy 1 diode, I bougth 2 in case 1 is failing or whatever, so I will receive 2 today.
But the new Xenon diagram needs 2 and the LPT cable needs 1, so I need 1 more.
Now I heard that the one from the LPT cable is optional (more a fix for those who had trouble), so in first instance, I can try with 2 diodes (soldering them like the new Xenon diagram) right?
Can someone confirm this?
And (I think) my last question: it is
http://i.imgur.com/Fdjmi.png or
http://pictures.xbox-scene.com/xbox360/free60/diagram.jpg right? I don't know what's the one I have in my box, but it can't be both right?