Ralley style offroad/fog lamps ?

[Northcompass]

I was thinking about adding a set of the fog lamps to my jeep and was wondering how they are mounted on the top of the bumper., I found a set on Ebay for sale, looks like they are just held in with a nut and washer on the bottom side ? would i be able to just drill a hole in the bumper to mount them ??

[Northcompass]

anyone

[Domesticrob07]

I'm not sure how they are bolted down, but I'm pretty sure that you could just bolt it with a lock washer and a couple of nuts to hold it up