the Xenium chips sit on the adapters as close to the FRONT of the xbox as possible. That is, the left over pins should lie towards the rear of your xbox. And yes the 'X' of Xenium goes toward the back of the box such that the chips LED points toward the left hand side of xbox as you look at it from the front.
You should check out this guide....http://teamxodus.com...iewtopic&t=8009
If you're doigna n install on a v1.6 box, check out this guide......http://www.teamxodus.....ll Manual.pdf
Also, if you want a refresher course I'd read 'The Iceguide'. Its the installation manual for the Xenium ICE but its still relevant for the GOLD. Just google 'The Iceguide'