OK, I don't think this will work (as I've tried ever other way I know of) but see if you guys can get these. This is the link for the Midnight Special '73 performance:
EDIT: I've taken the links out because my virus protection keeps freaking eveytime someone tries to D/L these (& they obvioulsy didn't work anyways so...), hopefully before too long I'll figure out the torrent stuff & post the audio & screenshots Steve MacD asks about later in this thread. 
Hope it works.
John