This is a simple adapter that is easy to 3D print, but if you don't have a 3D printer this will do. This will make the fan a bit thicker, so make sure you have some clearance. Another option if you need/want to use a 140mm fan and only have mounting holes for 120mm is https://www.amazon.com/dp. /B00V62IP7G?psc=1&ref=ppx_yo2_dt_b_product_details This is a 140mm fan with 120 pitch mounting holes. No RGB, but it moves a lot of air.
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