When I went to the race track the other day with a friend that races his 91 Mustang GT, I asked him why he still had his foglight brackets on. He told me that they hold the front bumper onto the car.....if thats the case, how do you guys get rid of yours?
Your friend is somewhat correct, they are not the only thing that holds the bumper on. What the do, is stiffen the lower area of the front bumper (all three brackets combined do this). As far as deleting them, I do not know, I like the lights and at about 7lbs combined weight why risk the front bumper flexing.
I don't have mine anymore because I switched to a different fog light set-up and made my own bracket. The bumber itself is still fine although not at stiff at the bottom.