CC-Tweaked/src/main/resources/assets/computercraft/models/block/monitor_advanced_ud.json

{
    "parent": "computercraft:block/monitor_base",
    "textures": {
        "front": "computercraft:block/monitor_advanced_21",
        "side": "computercraft:block/monitor_advanced_37",
        "top": "computercraft:block/monitor_advanced_0",
        "back": "computercraft:block/monitor_advanced_37"
    }
}