The original monitor needed is a GE Adventurer II. From memory, it uses a SF chassis that was used in a number of other GE TVs in the time period. If you only need the chassis, there are a few more options.
I picked up my Computer Space not working about two years ago. After messing with the wiring for a while, I got it up and running, but it has always had a really blurry / fuzzy picture. One of the pots broke while I was adjusting as well.....which hasn't helped.
I picked up a GE Adventurer TV about a year ago. The chassis looks nearly identical to what I have in the computer space.... so I should have two sets of monitors.
I am not that comfortable working with the monitors since I don't want to screw up with rare parts...... but once I grow some courage and get it working (or hire someone to get it working) you are welcome to the remaining parts.
Brian