My 2007 Frontier SE has the chrome bumper. Apparently, they are prewired for fog lights.
I went to the local Nissan parts people at two dealerships and they told me it was impossible to get fog lights. I just bought Nissan factory made fog lights and a new light switch that fits on the steering wheel.
It all just plugs in. If your SE is prewired, it is simple. Part kits are available from this Nissan dealer.
2005-2008 Nissan Frontier Factory Fog Light Kit