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You can leave the radiator on the inside and mount the fans above the case.   If you need to drill mounting holes or use a dremel to enlarge be sure to remove motherboard as the vibration can damage it.  Covering with a cloth is not sufficient.

You can also obtain narrow fans.  They cost more and usually make more noise as they need to run faster but they might fit.

 

You will need fan guards if fans outside the case and custom ones are interesting.


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