Tools to remove front bumper?

[mikey531]

I found a perfect chrome front bumper on a 72 GMC in New York. I was working and didn't have time or tools to remove it. My truck is in the body shop so I don't have access to it. What I need is what size wrenches do I need to take it off. I am taking a sawzall as a last resort but would rather unbolt it. Is it easier to unbolt the bumper or unbolt the brackets from the frame. It does have an old plow frame so that is in the way too. Thanks for any help.