I might want the dimensions of the glass I could get it cut. Mine is all splochy. So it shows on screen and looks horrible. Reminds me of that fake mirror finish from 70s and 80s that's just a film. It tarnished from old age or moisture.
Oh so you already have a mirror? I just bought a cheap glass one from the hardware store, used the mount as a reference and just cut to that size, easy to do with the cutter just score a line and snap it off although wear gloves/mask obvsiously.