Acer EB321HQU Spare Parts - Button replacement

Hi I've had this monitor since 2017, and about 6months after purchase, one of the buttons on the bottom became loose and wobbly but still worked. I took it into Currys/PC World to enquire about a replacement, but they wanted to send it back for repair which would take a while, and as I didn't have access to a spare monitor I just left with the monitor. About another 6 months later or more, the button finally dropped out. As it wasn't a button I used very much I just got on with it, but now the button beside is has just fell out when I touched it, and It's a button that I press often. Is there a way to get a replacement button set to replace myself?