Do these bolt straight to the factory bumper mounting points?

Yes. These are designed for factory Camry fog light holes — no drilling or custom brackets needed. Install is bolt-on at the factory rocker and bumper points.

Will I need to run new wiring all the way from the battery?

The integrated switch handles power distribution. Run the positive from your battery or existing fuse block to the switch, then to the lights. Ground at the chassis — standard 12V wiring.

Can I replace just one bulb if it burns out, or do I have to buy the whole assembly?

H11 bulbs are standard replacement parts. When one burns, swap in a new H11 — no assembly replacement needed. They cost a few dollars at any auto parts counter.