Unfortunately unless you've got some strong micro-soldering skills you might be out of luck. I've never tried them myself, but I believe these are the correct replacements: http://www.amazon.com/Laptop-Wireless-PCI-E-Internal-Antenna/dp/B004ZHT2JE/ref=pd_bxgy_pc_img_y
They simply wrap around the inside of the case.
Thanks Jason. Will get hold of the spare internal antenna and try it out.