Moved your thread to proper section as you seem to own a full size truck.
Not sure what you're asking here. If both low beams went out at the same time, I doubt it's the bulbs. Check the fuses and relay for the headlights (check inside fuse cover for which ones). The relay you could swap with another similar one from the horn or something like that. If those are ruled out, check the wiring and trace power going back from the headlights back.
If you actually need replacement bulbs, it uses 9006 bulbs for lows. Pick whichever brand you want.