English and Russian versions.
Install path should be:
X:\Users\YOUR NAME\Saved Games\DCS\Liveries\Cockpit_MiG-21bis\Clear Glass - (English or Russian)
If you don't have those folders, make them.
Choose this livery from the MiG-21 special menu inside DCS.
Passes IC.
To add this glass to a different cockpit skin you have to copy/paste all the text in the Russian description.lua file in between
livery =
{
and
}
then add it into the description.lua file in your desired cockpit skin folder at THE END right before the last } so it overwrites anything in the original easy.
Then add or replace the 3 .dds files in the Russian version into the desired cockpit skin folder.