Upon mounting I realised, that my "37mm" motor (CQRobot geared 70:1) has a slimmer chassis than the originally suggested Greartisan type, so back to the drawing board.

My speed controller had different dimensions as well.

So I remixed the square part of the enclosure to fit my controller and added a 5,5mm DC jack. (11,5 /10,5mm double D mounting)

To make the round sleeve fit, i simply added 0,6mm XY-hole extension.

Yes, this also shrinks the four mounting holes for the box, but the existing holes in the square part are a reasonable fit for ruthex M2 heat set threaded inserts, and the resulting mounting holes of the sleeve fit M2 Screws well.

Speed Controller: https://www.amazon.de/dp/B0BZTVMBXH

Motor: https://www.amazon.de/dp/B08ZK8NV4Q

DC-Jack: https://www.amazon.de/dp/B0BZRVLK18