Just like whitlock said, contact an Apple Authorized Repair Store (non-apple owned). Finding the parts online will be difficult. I would try local stores, or maybe they arn't so local. You may have to call and drive.
_________________________
"Fix it 'til it Breaks."

Jacob - EiC & Director of Technology
Mac Pro Quad 2.66 - 4GB RAM
160 GB SATA RAID 1 - 650 GB Storage
Quad 19" Widescreen LCDs
Accessorized to the Hilt