Panel opening shape: round. List of accessories Hole size: 20mm. Panel thickness: 3mm (maximum).
eBay
DaierTek 5PCS ON Off Round Rocker Switches SPST 20mm Mini 12 Volt DC Mini Circle Toggle Switch 12V for Car Automotive RV 2 Pin
Aliexpress UK
Wide range of circular switches with an optional waterproof cover. Commonly used with vehicles along with many other uses. 20 x Car Boat Rocker Switch（5 Red/5 Blue /5 Yellow/5Green）. Light source: LED.
eBay
DaierTek 5PCS ON Off Round Rocker Switches SPST 20mm Mini 12 Volt DC Mini Circle Toggle Switch 12V for Car Automotive RV 2 Pin
Aliexpress UK
When You Turn On The 12v Switch, It Will Remain In The On Position Until You Manually Turn It Off. Feature: Unlike Regular Mini 12v Rocker Switches, This 12v Rocker Switch Is Stamped "On/off", Which Is Much Easier For Users To Identify The Status.
eBay
5PCS 12V 20A Waterproof Rocker Switch Lighted Round ON Off 3 Pin 12 Volt Weatherproof Illuminated Toggle for Marine Car RV Truck
Aliexpress UK
12 volt switch for in car use. Ideal for Car PC. THE LED's WILL TURN ON WHEN YOU TURN ON THE SWITCH. Blue LED's will be lighted up when the switch is turned on. Easy setup. 3/4" hole is required and the switch will sit in nicely; don't need to cut outs.
eBay
Wall lamp switch panel tempered glass international switch 1/2/3/4 gang 1/2 way steel rocker light switch on/off stair switch
Aliexpress UK
When you turn on the 12V switch, it will remain in the ON position until you manually turn it off. 🏅Feature: Unlike regular mini 12V rocker switches, this 12V rocker switch is stamped "ON/OFF", which is much easier for users to identify the status.
eBay
DaierTek 6 Gang Switch Panel 12V Rocker LED Switch Panel 3 Pin 12 VDC 20A SPST On-Off Switch for Marine Boat Car Jeep UTV Truck
Aliexpress UK
eBay
EIOMR EU UK Standard Wall Light Switch 2 Gang 1/2 Way Bedside Switch 16A 250V 86mm*86mm Simple Style Large Panel Rocker Switch
Aliexpress UK
Wide range of circular switches with an optional waterproof cover. Commonly used with vehicles along with many other uses. 20 x Car Boat Rocker Switch（5 Red/5 Blue /5 Yellow/5Green）. Light source: LED.
eBay
EU/UK Standard Wall Light Switch 16A 250V 1 Gang 1/2 Way Wall Switch Socket White/Black/Gold/Gray/Silver 86mm*86mm Rocker Switch
Aliexpress UK
12V 24V BLUE & RED Dual LED Rocker Switch ON OFF 5 Pin Car Boat Marine SUV ATV. 1x Rocker ON-OFF Switch. Switch type: Rocker switch Off/On. - Black hard surface rocker. - Ultra-high-end luxury switch with LED indicator light.
eBay
2PCS 12V Latching Push Button Switch 20A Heavy Duty DC 12 Volt Waterproof Round Switch 16MM Metal Blue LED On Off Switch For Car
Aliexpress UK