The above link at alibaba is no longer relevant, but I'm researching this so I thought I'd document the findings.
Carling Technologies has two products:
1. These are their modular mounts for making your own bracket. They have an end bracket, and a middle bracket that you put together to create your preferred sized opening. I think 2 ends and 3 middle's fit the Radio-sized FJ40 hole pretty well (may need a zip tie behind to stop the wiggle - see #2 below, I can't remember which one I read about but someone had either #1 or #2 and used a zip tie to make it "good"). This setup pictured above looks like it is a Carling V series bracket.
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https://www.carlingtech.com/sites/default/files/documents/V-Series_Details_&_COS_111213.pdf (see page 23 for the brackets).
- Currently, in Nov 2022, WaytekWire.com has the brackets and switches:
P: Search: carling vm - https://www.waytekwire.com/products?pSearch=carling%20vm (I searched for "Carling" and "vm"). They also have a cover plate for blanks, and the switches to add to these.
Waytekwire.com screen grab
2. This second product looks sweet, but I know it is NOT an exact fit (bracket is too small for the radio hole, will need adapting, possibly with a 3D printed part, or maybe I read someone with a zip tie on the back of it was able to make it not wiggle about). I've seen photos of this unit installed in an FJ40. Just cannot lay my hands on it at this time. Someone with more patience at the moment may be able to find and cross link photos of other builds using the VM "electronic" set of switches.
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https://www.carlingtech.com/electronic-switching-products-vm-series
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https://www.carlingtech.com/sites/default/files/documents/vm-series_datasheet.pdf
Photo from product brochure PDF linked above.
Digikey carries some of these, thought not a complete line (I've used DK a lot, good website):
https://www.digikey.com/en/supplier-centers/carling-technologies
Mouser also has quite a few (these electronics websites require some patience and study):
https://www.mouser.com/c/electromechanical/switches/rocker-switches/?q=vm&m=Carling Technologies&product type=Rocker Switches
Amazon has some, but it's scattershot as Amazon tends to be these days. It's almost alibaba instead of Amazon these days... (Ranting).
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Here is the 6-gang cutout and bracket dimension for VM switches:
https://www.onlinecomponents.com/en/datasheet/vm601-44819833/ - several suppliers carry this.
Found this supplier from the carling website:
https://www.carlingtech.com/findarep?location=280
Measurements are in mm.