Review on ⚡️ BATIGE USB 3.0 Panel Flush Mount Extension Cable with Buckle - Single Port for Car Truck Boat Motorcycle Dashboard - 3ft Length by Ryan Saxton

No instructions but excellent quality. The hole you need to cut is 23cm x 12cm. First trace and cut out a piece of cardboard, then glue the back of the cardboard and circle the area to be cut out with cardboard. Take your dremel, trim the top and bottom with a round nozzle, then use a drill to trim the sides and smooth everything out. Be careful as the margin of error is small, then check the fit. Depending on the thickness of the plastic, you may need to trim the retaining pins slightly.