Can you provide more info on that switch? I don't have the same bed that you do, so I'd have to look to see if I have that hole, but I like your switch.
Also, can you describe your wiring method, "wired it to the existing bed lights"?
I've been avoiding wiring up mine, while I consider how I want to do it. I would like to avoid a T-tap. I also don't know what the wires look like behind the OEM switch. The left light is the light AND the switch, for the OEM kit.
I measured that hole at ~ 18mm so I went with a slightly smaller diameter switch (16mm):
The previous switch simply had 2 wires, the switch just made a connection for the wires.
For the new switch, red/green was wired to hot side of the previous switch wire, black was wired to the second wire.
Below: the black wire on the right hand side of the pic is the switch wire that runs into the bed and to the switch.
The left side is the fuse for the LEDs and you can see where I spliced into the factory LED bed lights.
The thick braided wire is the wire that goes to the factory LED that has the built-in switch
To get the switch to light up, the blue switch wire was ran to the same wire I spliced into. I used a posi-tap this time around.
For the LEDs on the front of my truck I used a fuse tap and a replay to trigger the LEDs to go on and off. A fuse tap saves you from having to tap into factory wiring. You can probably do the same for the bed lights but you would need to run wires from the fuse box under the hood to the truck bed.