Use a drill to drill more holes to match the existing hole pattern for the fan grill in your case. Then, drill 4 holes at the proper points to mount the 120mm hole pattern.
Buying a new case would be the easiest option, you will need to make sure there is a 120mm fan on the back of the case. I would recommend using Akasa Viper fans too for the cooling as they tend to be quieter and more efficient.
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