brush guards

Hi There - I have a 2013 6.7L Power Stroke. I purchased over a year ago used and it had an aftermarket bumper/brush grill installed at the time of purchase. I was recently in a minor accident and the body shop is looking to replace the bumper. I'm having trouble locating the exact same brush...

So, recently I found out my boyfriend has been talking to his mom about buying a brush guard. well.... what exactly would I need to know about his truck and about brush guards in order to buy him an efficient brush guard.. Some questions I have that I would really appreciate the answer to...