This is the only really good "artifact" from those ARMS Shows---this dvd-
http://www.geetarz.org/reviews/misc/arms-dvd-2-brazil.htm
I have dvd's of Cow Palace and NYC shows, pro shot, soundboard audio and the video is not perfect.
I also have the LA show you saw and the Dallas show (11-28-83) I have all the ARMS shows played either on video or audio.....
The above is the only one you would probably want, the others are bootlegs and aren't A+ perfect.