I've seen light bars added to an air dam, but as far as replacing the stock lights, it sounds like your wanting to stick a square peg in a round hole?
I've seen some round LED housings occasionally, it might be possible to integrate those into the stock housings somehow with maybe a little fabbing of a mount and rewiring. I've never seen an example of it though. It's something to explore I'd say, might turn out really well if you find a LED product that fits in the stock light hole.
Personally I'm not a fan of seeing LED light bars on OR/P4X stock air dams, in the way I've seen it done by some. You have round lights, and a long rectangular bar in the middle, and I just think it looks tacky. The mixing of round and squared shapes doesn't look aesthetically well planned to me. If I were to go that route I'd just remove and sell my air dam and lights (which you can get good money for sometimes) and get a normal air dam without the frog eyes to mount stuff to with a cleaner slate to start with.