How to turn on keyboard backlight for Lenovo z50.

Hi,

According to Lenovo support site just press "fn + the spacebar" together at the same time. But according to Lenovo support as well to make sure that the spacebar key has a small symbol on it that means your keyboard has back light but if it doesn't have on that means it didn't came with a back light keyboard. There are 2 model of your laptop which is almost completely identical and the only difference is the back light keyboard.
 


So where can I buy one of these key backlight key boards for the Lenovo Z50-70 than ?
I have been looking but I can not find one for my laptop
 





Have you bought a backlight keyboard for Lenovo z50?