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This mount is intended for use with the Mamba Monster 2 Esc without its upper case. It won't fit older versions but is also suitable for the Mamba Monster X!
But for the Monster X there this mount is perfect:
It allowes you to mount your own 30mm fan. (hole to hole space 23.9mm)
Hole to hole distance for mounting in the chassis is 52 mm.
May contain small parts. Don't let children get it, danger of suffacation!