You could get 4" round marker/turn combination lights, and something like a 2" driving lights or fogs in the outer smaller holes. Plenty of much better places for off-road lights, and the marker/signal combination lights add visibility to your vehicle. My personal preference would be some blazer fogs mounted behind the outer holes. The housing is a hair over 2.5", but the lens portion is only 1.75"
Link and then something like
Hella DE fogs might work for that hole too, but I think the Blazer fogs would end up looking a little better behind that hole.
This for your 4" hole. They mount in a rubber grommet that would be a nice tight fit in the hole you have already, and they will stand up to a little abuse.
You could do it the other way around too, use a 2" marker in the outer hole, and find some ~4" fogs for the center.
Or you could just do a 4" marker/signal in the larger holes, and a 2" marker in the outer. Or the opposite, fog/driving lights in both positions.
Really, it just kind of depends on what you are looking for...