Hi there, 
First of all sorry for my bad English. I hope I was able to get my idea to you.

I would like to know what I can do if there will be a need to change optical line switches in Z20. I found out that they are called LK light strike (optical), but I didn't find where i can buy them if necessary. I couldn't find any other information about them: how many pins, what a form factor, etc.
I only found optical switches from the Gateron on Aliexpress, but I'm not sure if they are replaceable switches with the ones installed in the Z20.
 
I don't live in the USA. I live in Georgia (not a state) but I'm going to buy a Z20 in the US via Amazon in USA. Therefore, Actually i cannot rely on the RMA if a problem arises.
Of course know about Z15 hot swap and standardized switches that are used there. But my question is not about that.
So, any suggestions, advice or info? 
 
Thanks in advance.

EVGA_James
Z20 is not a hot swappable keyboard. 

Thank you for your reply. 
I know. 
My question is what switches are installed in Z20? If there will be a need to replace them (not via hot swap) how i will be able to find replacement.
Actually question is simply: Which switches are sued in Z20?        

EVGA_James
The switches themselves are as you mentioned LK Light Strikes. They wont need to be replaced as there is really nothing in them to fail. Its just a plastic housing, stem, and spring. What activates the keypress is the stem blocking or letting the light beam pass through to the sensor which is on the PCB. 

OK. Clear. Thank you.