Finally found a matching monitor for my Aptiva setup. IBM model 6327-022. After cleaning and repairs, it turned out to be really good one. Left hinge for the controls door is broken, but it stays in place when closed. Other than that, it is now near perfect condition.
When I got it, it didn't show any image. Had to replace couple of capacitors and redo some solder joints on the neck board to get it going. VGA connector was crushed, so I had to straighten it. It was very tidy inside, almost no dust at all. It has nice Panasonic tube, that is really bright, colorful and sharp across the screen.
Only thing is, for some reason Aptiva's Creative Graphics Blaster EXXTREME (Permedia 2) won't output anyhing greater than 800x600@85Hz for it. When I was testing the monitor on another machine with S3 Savage4 Pro, it went up to 1280x1024@75Hz.