Thanks guys. The 1980 soundmix provided by Mattman works perfectly, so I'm uploading right now. Empire contains 5 soundmixes now:
1) hairy_hen's 5.1 purist mix @ 448Kbps AC3
2) 1993 2.0 mix @ 320Kbps AC3
3) 1980 2.0 mix @ 224Kbps
4) 1992 2.0 CZ dub @ 192Kbps
5) 1997 2.0 CZ dub @ 192Kbps
I put in both CZ dubs simply because there was space for them. This gives anyone space to replace them with any desired soundmix.