The file I uploaded are in 256 Kbps VBR AAC which should be on par with 320 Kbps MP3
I purchased them from iTunes. I don't know if 320 Kbps MP3 is ever sold.
They were on Spotify in the past, so if someone managed to download them, then the 320 KBps MP3 file might exist. Else just convert from the AAC files.