I know you already found these but the Odd Soul stems are on the "weareoddsouls" YouTube channel, and hopefully they are higher quality. Obviously you can use a youtube video to mp3 (or other format) converter to get the audio files. https://www.youtube.com/user/weareoddsouls
As for the Monument stems, I found a torrent: (https://now.bt.co/bundles/mutemath-monument)