There are M3 mounting points on the face.
DC Motor Speed Controller Universal DC 12V 24V 10A Electronic Stepless DC Speed Regulator Switch for Car Truck Fan Heater Control
DC Motor Speed Controller Universal DC 12V/24V 10A Electronic DC Stepless Speed Regulator Switch for Car Truck Fan Heater Control
RioRand PWM DC Motor Speed Controller – 6V-28V 3A Reversible Speed Regulator with Forward/Reverse Switch for Low Voltage Brushed DC Gear Motors, Hobby & Small Automation Projects
Hosyond PWM DC Motor Speed Controller DC 7-70V 30A 12V 24V 36V 48V with 30 Amp Fuse
HUSETOO DC Motor Speed Controller ，DC 12V 24V 36V 48V 60V Pulse Width Modulation PWM Monitor Dimmer Governor ，1200W 20A CW/CCW and Rotary Switches
DC Motor Speed Control Pulse Width Controller - Adjustable Handle Duty Cycle 0-100% | Non-Voltage Regulated | DC 7-70V Input, Built-in 30A Overcurrent Protection
