There are countless aftermarket driving lamps designed to fit these holes. And the plug for the power to them is attached to the left front area of the wiring harness already.
If you want the lamps to operate using the same protocols, you will need to purchase a relay, switch, and additional wiring harness that go behind the dash. These are expensive, but the plugs are proprietary and cannot be bought as separate items.
I got the schematic, the wiring diagram, and even the specific part numbers for all the individual components, and the plugs’ drawings with their physical parameters, for my tC thinking I was going to be able to buy just the proper plugs and make up my own wiring harness, use a generic relay, and a generic switch to save money (the Toyota ones are expensive). I searched everywhere for plug matches including electrical plug manufacturers’ to no avail. I finally went to the Toyota parts window to order the plugs… I had the Toyota part numbers, remember, but when the parts guy looking it up it was “unavailable for purchase”. I gave up and bought the Toyota harness, relay, and switch. I used generic driving lights, but had to spend the small fortune on the other components.