A typical monitor used at the time for those Williams Games of the 90's (Mortal Kombat series, NBA Jam series, etc.), were Wells Gardner K7000 series.
The monitor came in a few sizes and native resolutions - most applicable here:
Standard:
19" 400x240 resolution
25" 560x240 resolution
Fine Pitch:
19" 640x240 resolution
25" N/A
As an example, Mortal Kombat II outputs 400x254.
The standard 19" monitor fits practically like hand-in-glove, especially when accounting for typical 19" standard resolution and overscan/cropping. Arguably though, the 25" variety was the most commonly leveraged for those cabinets.
If the monitor used is 25", or the 19" fine pitch variety, then, as mentioned, operators, especially then, may have tweaked the controls to fill the screen, or whatever other personal preference.
Another popular monitor used with such cabinets of the time is the Hantarex POLO monitor, which advises, per it's service manual "MONITOR CONTROLS" section:
"Adjustment of horizontal amplitude stretches the image..."
Both monitor lines are standard CRT, 4:3 screen aspect ratio.
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