Razer Deathadder Elite scrolling wheel encoder

Hello, I have an internet cafe. We have Razer Deathadder Elite's and their scrolling wheels failed. I purchased the 14mm encoders from Aliexpress, however they dont have the feed back feeling (tik tik sound). Where can i buy the original 14mm encoders?. Technical service in my country (Turkey) doesnt help me. I have more than 10 Razer Deathadder Elite's the same problem. They are out of guarentee. Waiting for your kind reply. regards