I had the same problem some years back as the reflectors were both limited and expensive, so I fabricated something different.
Nothing unusual about mesh, but it can look a bit rubbish if it's just slapped across the back of a gap and everything else is visible through the hole. To appear factory original, as I'd had on other cars, it needs to be shaped, and the back needs filling in to hide bright washer bottles etc that show through. I used the original reflector to create the shape for the mesh, then colour coded it to match the front slats. Some matt black plastic recessed in the hole blanks off the gaps. It's not as bright as the camera makes it appear.