Readynas X6 or 600 Motherboard used?

mdgm wrote:
No spare motherboards. However if you keep both NAS units on the same firmware as each other it should be possible to recover data from the other if one NAS breaks down (assuming drives are still good): http://www.readynas.com/kb/faq/boot/how_do_i_migrate_disks_over_from_an_existing_readynas_to_another

I realize that netgear does not sell spare motherboards however I was under the impression that it used a motherboard from a general motherboard manufacturer. I noticed that one of my devices uses Patriot RAM sticks which can be purchase off the shelf. I was hoping that maybe the motherboard could also be purchased, especially the model which uses standard SATA cables.