I've got two left from a batch I made in the past. I found the stock aluminum material at OSH (local hardware store). Each sheet (costs about ~$25) will make four.
Mine are hand crafted and aren't perfect but it works. I'm really not interested in making more.
The vectors on some WG6100 monitors are shaky without the HV cover.
$13 + shipping. PM me if you want one.
-Frank