Think yourself lucky that they used screws to hold the back on - most modern monitors are just clipped together and it's a right PITA to get apart.
I assume the caps are in a switch-mode power supply and are in series, in which case the voltage is OK. If they are not in series then you would be better getting 380V units.
Again, if they are in the power supply then you should also try and get ones with low ESR.
One other thing I must say - be very careful when poking about with the power supply - undischarged caps of that size can *kill*!
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